Lastindexof and includes method javascript lesson 44

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in javascript, the `lastindexof` and `includes` methods are essential for string and array manipulation. the `lastindexof` method searches for the last occurrence of a specified value in a string or an array, returning the index of that position. if the value is not found, it returns -1. this method is useful for determining the location of a substring or element from the end of the collection backward, facilitating tasks like validation or search operations.

on the other hand, the `includes` method checks whether a string or an array contains a particular value, returning a boolean—true if the value is found, and false otherwise. this method is particularly helpful for simple existence checks and is case-sensitive in strings. both methods enhance the ability to work with collections, allowing for efficient data searching and validation in various applications. understanding these methods is crucial for effective javascript programming.
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