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Hey buddy this is Caleb with Deb's Lopes.

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You didn't think you were getting off that easy did you.

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I have a challenge for you before we go on to the next section.

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So go ahead and pull open your r x playground.

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We're going to challenge you or I'm going to challenge you to play around with observables and to do

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something for me.

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So I'm actually going to start by renaming this observables and let's hope that it doesn't crash on

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me.

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But changing the name looks like it's fine.

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All right.

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So right click and click new playground page.

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We're going to call this observable as challenge and like before.

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We're going to go ahead and select all and delete although I guess you have to select one with the number

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one of the lines with the numbers.

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Select all and delete.

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Then you're going to need to import our X swift import playground.

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I can't type.

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Playground support and then call playground page dot current dot needs indefinite execution.

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Equals true.

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Just like we've been doing.

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Then here are your directions.

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1.

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Create a Dispose begge instance call Dispose bag then create an observable that holds an array of int

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values.

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Then create a constant and subscribe to the observable using on next after that.

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Inside the brackets of the next closure.

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Create a constant and set its value to be Dollar Sign 0 multiplied by 5.

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Remember the dollar signs zero is used to capture each value from the arrays it goes through as a temporary

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variable.

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Then print the constant that is dollar signs 0 multiplied by 5 and at the end.

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Call this call add disposable to and pass in your dispose bag.

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That is your challenge.

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Go at it now.

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I'll see in the next section when we talk about subjects.

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Good luck.