1 00:00:00,720 --> 00:00:01,680 Hi everyone. 2 00:00:01,680 --> 00:00:05,100 Let's now code together the first method that we discussed. 3 00:00:05,130 --> 00:00:07,560 Now for this we are going to create a function. 4 00:00:07,560 --> 00:00:10,320 Let's call it is palindrome check. 5 00:00:11,110 --> 00:00:14,080 And we're going to pass in a string to this function. 6 00:00:14,080 --> 00:00:20,020 Now what we're going to do is we're going to create a new string from the back of the given string. 7 00:00:20,020 --> 00:00:20,350 Right. 8 00:00:20,350 --> 00:00:25,210 We'll take character by character from the given string and insert it into the new string. 9 00:00:25,210 --> 00:00:26,200 So let's do that. 10 00:00:26,200 --> 00:00:29,170 For this let's create a empty string. 11 00:00:29,170 --> 00:00:33,580 So let um new string. 12 00:00:34,590 --> 00:00:36,150 To compare. 13 00:00:36,330 --> 00:00:38,460 So I'm just calling it new string to compare. 14 00:00:38,490 --> 00:00:40,110 Now this one is empty. 15 00:00:40,260 --> 00:00:48,150 Now we're going to have a for loop for let I is equal to string dot length minus one. 16 00:00:48,150 --> 00:00:51,630 Because we want to go from the end of the input string right. 17 00:00:51,630 --> 00:00:56,700 And I greater than equal to zero I minus minus. 18 00:00:57,000 --> 00:01:04,800 And as we traverse the input string from back to the front, we are going to take one character at a 19 00:01:04,800 --> 00:01:07,620 time and append it to the new string. 20 00:01:07,620 --> 00:01:12,390 So let's do that new string plus equal to. 21 00:01:13,480 --> 00:01:15,070 String I. 22 00:01:16,830 --> 00:01:17,190 Right? 23 00:01:17,190 --> 00:01:20,760 So at the end of this we would have created a new string. 24 00:01:20,760 --> 00:01:26,880 Now all we need to do is we need to check whether this new string is the same as the given string. 25 00:01:26,910 --> 00:01:31,200 Now if it is the string same, then we will return true, right? 26 00:01:31,200 --> 00:01:33,060 So we can return true. 27 00:01:35,520 --> 00:01:42,750 And if it is not so, if if it's not true, then we can just return false. 28 00:01:43,970 --> 00:01:44,240 All right. 29 00:01:44,240 --> 00:01:47,990 So even over here also, I could have just written because it's just one statement. 30 00:01:47,990 --> 00:01:49,760 So let's just make it smaller. 31 00:01:50,590 --> 00:01:54,610 Now it's one and the same, so I'm just making it smaller. 32 00:01:54,610 --> 00:02:00,460 So we are going to return true if they are the same and if it's not the same, then we are going to 33 00:02:00,460 --> 00:02:01,330 return false. 34 00:02:01,330 --> 00:02:04,300 And that's the function that we have written. 35 00:02:04,330 --> 00:02:04,660 All right. 36 00:02:04,660 --> 00:02:05,830 Now let's test it. 37 00:02:05,830 --> 00:02:07,930 For this I'm creating a string. 38 00:02:07,930 --> 00:02:10,660 So let this A be equal to. 39 00:02:11,230 --> 00:02:13,450 Let's say the given string is ABC. 40 00:02:13,750 --> 00:02:18,850 Now let's pass it and console log what we get to our function. 41 00:02:18,850 --> 00:02:20,200 So is palindrome check. 42 00:02:20,200 --> 00:02:21,310 And we are passing a. 43 00:02:21,310 --> 00:02:21,880 All right. 44 00:02:21,880 --> 00:02:25,330 So let's now see what we get when we run this. 45 00:02:27,140 --> 00:02:31,040 So when I run this, I get false because ABC is not a palindrome. 46 00:02:31,040 --> 00:02:33,410 What about if it's ABC ba? 47 00:02:33,890 --> 00:02:36,320 So and now I get true because it's true. 48 00:02:36,320 --> 00:02:36,650 Yes. 49 00:02:36,650 --> 00:02:37,850 This is a palindrome. 50 00:02:37,850 --> 00:02:42,380 Now what if it's a single character string I get true. 51 00:02:42,380 --> 00:02:42,740 Yes. 52 00:02:42,740 --> 00:02:43,820 So that's good. 53 00:02:44,330 --> 00:02:46,790 And what if I have small A and capital A? 54 00:02:46,790 --> 00:02:52,640 I get false because in the clarification we got the clarification that these are treated separately. 55 00:02:52,640 --> 00:02:54,890 So yes we have coded our first solution. 56 00:02:54,890 --> 00:03:00,530 Now let's take a sample input and see what's actually happening over here.