React Js Series for Beginners தமிழில் 34 : Iterate Over Object, Array & String using for_In_loop

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The for-in loop is used to go through each property in an object. It helps you access each key in the object to do something with its value.

To loop through an object, like let obj = { a: 1, b: 2, c: 3 };, you use the for-in loop. Here’s how it looks: for (let key in obj) { console.log(key, obj[key]); }. This loop goes through each key in the object and prints both the key and its value.

Although the for-in loop can be used with arrays, it is not the best choice because it also iterates over any extra properties added to the array. For example, with let fruits = ['apple', 'banana', 'cherry'];, you could use: for (let index in fruits) { console.log(index, fruits[index]); }. This will print the index and the value of each item in the array.

You can also use the for-in loop with strings to access each character’s index. For a string like let word = 'hello';, you can write: for (let index in word) { console.log(index, word[index]); }. This prints the index and the character at that position in the string.


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🕘Timestamps:
00:16 - Overview
00:23 - Iterate Object- for-in Loop
04:18 - Iterate Array- for-in Loop
05:42 - Iterate String - for-in Loop



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