Скачать или смотреть How to use string includes in javascript

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in javascript, the `includes()` method is a straightforward way to determine if a specific substring exists within a given string. this method returns a boolean value: `true` if the substring is found and `false` otherwise. to use it, you simply call `includes()` on a string, passing the substring you want to check for as an argument. the method is case-sensitive, meaning that "hello" and "hello" would yield different results. additionally, `includes()` can take a second optional parameter, which specifies the starting position in the string from which the search begins. if omitted, the search starts from the beginning of the string. this method is particularly useful for validating user input, searching for keywords, or filtering data. overall, `includes()` provides a simple and effective way to work with string containment in javascript applications.
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