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Hey everybody this is Kayla with slopes.

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And in this video we're going to start downloading information from the flicker API.

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We just got our API key in the last video and we wrote a function that can build us a nice u r l that's

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perfect for accessing the API.

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But in this video we're going to go ahead and retrieve a list of the you are Elle's for all of the photos

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that we're going to download.

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Then in the next video we're going to write another function to retrieve all of the images.

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I wanted to separate these two because they're a little beefy and we're going to be diving through some

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of the Jaison parsing through it and it can get a little intense.

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So I just wanted to separate these functions into two separate videos.

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So let's let's get started.

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Pull open that X code project and we're actually going to start by going to our map Visi and we're going

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to write two functions one for retrieving all of you or else that will be this video.

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And then in the next video we're going to write retrieve images which is going to download all the images

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using Alamo fire image.

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Very cool.

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Let's go ahead and at the very bottom of our class here let's go ahead and write phunk retrieve you

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ourselves and we're going to retrieve you or else for an annotation.

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Right because we drop the annotation on our map view.

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And when we drop that annotation it has coordinates and we need to pass those in.

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So go ahead and type retrieve your elves for annotation.

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Give it an internal parameter of annotation and that is of type drop a pin our custom annotation.

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Now we're also going to use a completion handler because we need to know when we're done loading all

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of these you are else to call retrieve images because once that's done once they're done then we need

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to notify retrieve images that it should start downloading images from those you or else.

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OK.

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So to make a completion handler just go ahead and type handler and it's going to be of type escaping.

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K that means that the values can escape the ones that we pass into this handler can escape out of this

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function and talk to another function in our circumstance.

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Now we need to put a function in here because that's how completion handlers work is that we're basically

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going to pass in values to this function and then we can pass that down as soon as it's done to the

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next function or the next.

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The next thing that we need to do so.

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Handler escaping and then inside of here we're going to put an underscore status of type bool.

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OK that's the function.

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And then we're going to return an empty an empty parentheses.

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So we're not we're not returning anything.

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But you'll notice oh it's giving me an error we need to of course put curly brackets and that is our

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function that's the base of our function.

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Now you're wondering why are we putting this underscore here.

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Watch what happens if I get rid of it if I try to build it it's going to give me an error and say function

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types cannot have argument labels.

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So we have to use an underscore because we're not allowed to use the name for whatever reason.

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So now here is what we are going to do.

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We're going to first set up an array that's going to hold all of the image you are else.

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So go up to the top and we are going to create an array.

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Let's see where should we put it.

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Let's put it down here below the collection view.

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And we're going to call it image you Arel array.

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So go ahead and create an instance of it called var image your L array.

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And that's going to be of an array of type string and we're of course going to instantiate that as an

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array of type string.

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Ok image you are LRA.

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Very cool.

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Now when we go back to our function here retrieve you or else when we first start we want to close that

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out.

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We want to clear it out so that it is empty.

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So go ahead and type image Yoro and make it empty.

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This is because if let's say we downloaded all the images downloaded all your files I mean and then

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we double tap to drop a new pin.

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Suddenly we would be adding a bunch of your L's on top of the ones we already have.

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So we should clear it out every time that we call this.

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OK.

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Are you ready.

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We are about to move on to use Alamo fire.

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Elmo's Fire is how we're going to make a request and pull down data as Jason.

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So follow me here.

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We're going to type Alamo fire.

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Oh of course we need to import L.A. fire first.

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We haven't done that yet.

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Import the library Alamo fire in port Alamo fire.

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And you know while we're at it go ahead and import Alamo fire image and then scroll back down to where

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we were in retrieve you ourselves.

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OK.

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Go ahead and type.

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Alamo fire dot request.

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And we're going to choose the one with our El convertible.

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Now your old convertible allows us to pass in a string and this is where we're going to pass in our

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flicker you are el.

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So go ahead and call it flicker Jaro for API key we can pull API keys straight from our Constans file.

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The annotation here is going to be of course the annotation from our function and number of photos we're

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going to go ahead and let's just do 40.

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OK.

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So there's that.

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Our request has been made but we need to do something with this request.

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Now we need to go ahead and see what we're going to get as a response.

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So go ahead and type response Jason.

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OK.

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And this means that we want the data to be pulled down as Jason data as we saw in the previous video

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that's totally possible with the flicker API and so we're going to do it.

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So for the completion händler just press enter and we're basically going to be looking at the response.

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So go ahead and type response and this constant is going to hold the value of whatever Jaison we get

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back.

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So now we need to actually print the response just to see what we get.

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All right.

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That's that we're going to print the response we're going to see what we get and then we're going to

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parse through it so that we can get all of these nice image you are Elle's ready for us.

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So let's go ahead and let's call this function from somewhere.

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I think the best place we could call it would be from where we drop our pins so let's go to drop pan

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Let's go ahead and at the very bottom.

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Go ahead and call retrieve your else for annotation past the annotation that we make when we dropped

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the pin and for the handler we're going to go ahead and press enter.

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And if you saw the status here is a Boolean that means when it's finished we're going to call that.

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OK.

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Easy peasy.

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And you know what.

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At the end why don't we call it so that it just knows that it's done and that's when we'll know it's

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finished.

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OK.

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So we'll just say true.

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And in the code We'll just print or no you know we don't need to do anything actually when this runs

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it's just going to go ahead and print the response here.

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So let's go ahead and build and run this let's drop a pin and that will allow us to see what is getting

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downloaded from the Jason K we're zooming in here we go double click and it looks like hey hey we got

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a bunch of Jason here.

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All right look at that.

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We have the page the number of pages the items per page and then look at this.

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These are all of our photos here.

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There is lots of information here.

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So each photo has a farm an ID a property for is family is friend is public an owner a secret a server

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and a title.

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Lots of information for every single photo.

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Now I want to show you something.

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If you go to flicker dot com and you view any photo on the site you'll notice something interesting

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about the URL so let's go ahead and let's go find a photo.

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We can look at maybe this one here and let's see if I open the link.

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You know what.

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It's not going to let me access the photo I don't think.

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That's OK though.

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Oh yeah.

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Maybe download can download it here.

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And let's download a large sized image.

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I'm going to copy the link actually and then show you what the link looks like.

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Now I want you to notice one thing it says here farm one.

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Do you see how in these photos it says farm five farm five farm five farm five they're all farm five.

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This one's farm six farm nine.

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That's the way the you are is structured farm.

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And a number of statics liquor dot com slash.

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And then it has a server value for 1 5 6 2 8 2 2.

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This one is from server 6 7 9.

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Then we have an owner.

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The owner key is right here.

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OK.

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And that goes here.

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You can pass that right there.

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Actually sorry that's the idea the first one is the ID.

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The second is the secret.

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OK.

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And finally Kay is for a large photo and D goes at the end just as a standard part of how the RL is

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structured.

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So as you can see the URL is pretty complicated to parse and that's why I wanted to make this into a

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single video.

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I hope you can understand that.

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But thank you for being patient with it being just in a single video.

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So let's go ahead and let's actually look at what we're dealing with here.

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We have a dictionary first and foremost and inside that dictionary is another dictionary called photos.

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OK.

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Then inside of that dictionary there's an array which we can see here with that print see parentheses.

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There's an array of more dictionaries.

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OK these are all individual dictionaries for each photo.

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So we're going to have to go ahead and parse down through a dictionary which is the Jaison we receive

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initially then we're going to cast that as a dictionary and we'll cast that as an array of dictionaries.

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OK so let's go do that inside of our Alamo fire function.

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We know what the response is.

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That is a dictionary.

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So let's create a constant called Jaison and let's do this safely guard.

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Let Jaison equals response.

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And in order to get this Jaison information we can type response the result value ops response that

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result value.

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And we need to actually cast this as a dictionary of string and any object and I can see that each of

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these values here is a string and the object that can be returned can be an integer.

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Sometimes it can be a string sometimes it could be maybe a decimal place if it had a coordinate.

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So we're going to do string and any object to make sure that it's safe at the end of our guard statement

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we'll type.

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Else.

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And then of course we will return if there is a problem.

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So now we're going to use this Jasen which is a dictionary of string and any object we're going to use

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that in order to get into the photos dictionary.

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So let's go ahead and let's type let photos dep't for dictionary and make that equal to Jaison.

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And if you look the name of that element is called photos.

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So we're going to actually type photos and that's going to bring out that dictionary.

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Now of course we need to cast it as a dictionary of string

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and any object.

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And why are we doing that.

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Well if you look at the Jaison here we can see that Fotos has a little bracket here and inside of this

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dictionary there are some keys right and some values.

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And for photo photo is the key and the value is an array of a bunch of dictionaries of photos.

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OK.

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And we're going to get into that in just a moment.

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So now we have accessed the photos dictionary and we need to go a little bit deeper it's kind of like

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going into different levels of Inception we're going down into the third level of sleep.

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Sort of but not nearly as cool.

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Actually more cool because it's code and codes cool.

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So let's go ahead and do that.

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Let Fotos dictionary array because it's an array of photo dictionaries.

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We're going to make that equal to photos.

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DICT.

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And we're going to pull out the element called photo right because that's what we see.

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Photo is the key.

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And we want the value.

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So let's go ahead and call.

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Photo from photos dictionary array.

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And we're going to cast this as an array of dictionaries that are of type string and any object.

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All right.

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Easy enough.

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Now of course it's telling us that we're not using it yet but we're going to go ahead and cycle through

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all of those photos and we're going to generate a u r l based on the information that we have here.

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So for photo in photos dict array we're going to use a for loop cycle through all of them.

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We're going to first create a post u r l and then we're going to append it to our image you are LRA.

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So go ahead and create a constant called Let post you are ill.

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And for this we're actually going to go ahead and use a string.

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We're going to look at the your L from safari.

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We can see it starts with h TTP s.

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Backslash backslash.

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So let's go ahead and type that.

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Great.

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Next we have a farm and a number.

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So I know that farm can be typed but you know what we're going to need to get out the value from photo

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for the farm so to do that we're going to use string concatenation.

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We're going to call photo because remember that's its own dictionary and we can pull out the value for

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one of the keys and the key is farm when we call farm for this one we get a farm of five.

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But you know what we actually need to force unwrap this so that we pull out the value successfully.

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So for this example we have to slash farm five k.

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And after that we can do dot static flicker dot com.

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So let's type that at the end.

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Static flicker dot com slash.

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And now what.

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Six seven nine.

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Now I'm going to give you a clue that is actually the server number.

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OK I told you that before but that is what it is.

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So to get that we're going to use string concatenation again.

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I'm sorry string encapsulation.

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I always flip those terms and we're going to go to the photo dictionary and we're going to pull out

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the value for server force and wrap it as well.

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OK so now we have the value for the server number.

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So for this example the server number would be 4 to 1 1.

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Okay.

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Next up we're going to go ahead and pull out the photo ID.

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That's like the unique ID of the photo.

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So if you look at the you Arel this last part starts with the ID right here.

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OK.

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So we're going to go ahead and use string encapsulation again to pull out photo and call the ID parameter

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and force on rapid.

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Wonderful but you'll notice that right after the ID there's an underscore.

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OK so let's put that in R U R L and then after that we actually need the secret K and you can see the

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secret right there.

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So let's do what we've been doing string encapsulation photo whoopsies.

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Toe.

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And we're going to pull out secret and force and wrap it.

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All right.

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After that we're going to go ahead and do underscore K.

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Let's do that underscore K underscore d dot Jaypee.

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And you know what that is r u r l.

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That was really messy having to siphon through all of that Jason.

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But we now have a post u r l and we know exactly where we can append that image u r l array so let's

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do that.

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Go ahead and type self image u r LRA.

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Append new element post u r l and that is that.

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So once we have cycled through all of this image you are all image you are LRA will be nice and full.

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And at the end of that call we can use our handler to escape to notify us that we're done downloading

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all your else.

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So go ahead and type handler whip's handler and pass in a boolean of true so that is done make sure

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that you study this and go through it.

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If you already have experience with Jaison this might be quite easy for you.

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But if not it might take a while to understand what's really going on here.

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But let's go back up to where we call this function in dropped pin and I'm actually going to print out

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the image you are LRA so you can see all the imagery or else that we've just made.

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So go ahead and type print image you are LRA and let's build and run this app.

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Oh whoops of course we need to make a reference to self because we're inside of a closure here and retrieve

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you or else build and run and we're going to see if this worked if our your L's are being properly downloaded

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and pulled out from our Jason File.

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So go ahead and double click and look at that.

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That looks pretty good.

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Let's see farm five static flicker dot com slash for two on one there's the ID secret Cady to double

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check that this worked.

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I'm going to actually copy one of these into my browser and see if it worked.

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Kate says this photo is no longer available so that means we did something wrong.

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Let's see if we can figure out what the issue was.

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Or alternatively that image may actually just be deleted or not available.

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OK so that's not good.

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It's telling us that there is a problem farm five static flicker dot com slash server slash ID secret

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k d.

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So let's go back to that photo we had of our gorilla friend and let's see whoopsies Let's see what the

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your L was when we copied the link pasted it here.

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Let's take a look.

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What did we miss.

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Farm one static flicker dot com server ID secret k.d. lang.

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Hmm interesting.

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So we may have missed a slash here or there.

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Let's go ahead and let's head down.

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We have the farm number.

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We have static flicker dot com.

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Is that all right.

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Static flicker dot com slash the server number.

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OK.

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And we have Yeff the farm the server number we have the ID underscore the secret Cady.

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You know what.

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Let's see there are some other letters HD for instance downloads a medium sized image.

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So let's see if it's just an issue with using large images.

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And you know what it looks like.

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That was the problem because it just downloaded the image here for me in medium size so it looks like

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maybe large images are not accessible by the API.

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That's good to know.

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So let's go ahead and replace k with h.

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Let's build it one more time and you should be able to see a giant list of properly formatted you or

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else show up right here in our console.

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Let's do that.

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Here we go double click downloads all those you are else.

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Lovely.

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And let's go ahead and let's paste this into safari.

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And here we go.

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All right.

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It downloaded.

314
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And here we are.

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There's somebody at Disneyland.

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Awesome.

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So it is properly downloading the images.

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We have lots of you or else in the next video we're going to use these you are else to download those

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images and save them into our application using Alamo fire image.

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Amazing job.

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And let's head over to the next one.