React Js Series for Beginners தமிழில் 40 : Array Methods - indexOf() & lastIndexOf() in Javascript

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The indexOf() method helps you find the position of the first occurrence of a specific item in an array. It returns the index number where the item is found. For example, if you have let fruits = ['apple', 'banana', 'cherry']; and you use fruits.indexOf('banana');, it will return 1 because 'banana' is at position 1 in the array. If the item isn’t found, it returns -1.

The lastIndexOf() method finds the position of the last occurrence of a specific item in an array. It returns the index of the last time the item appears. For example, if you have let fruits = ['apple', 'banana', 'cherry', 'banana']; and you use fruits.lastIndexOf('banana');, it will return 3 because 'banana' is last found at position 3 in the array. If the item isn’t found, it returns -1.

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00:15 - Overview
00:25 - indexOf() method
06:15 - lastIndexOf() method

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