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JavaScript Introducing ES2015 ES2015 Basics String Search Methods

.indexOf method

why was this expression true in this video? i dont understand what this method is doing. what exactly is the zero index of the string?

1 Answer

strToSearch.indexOf(searchvalue) returns a number representing the position (starting at zero) where the specified searchvalue occurs for the first time, or -1 if it never occurs in strToSearch. 0 is the location of the first instance of 'a-really' in 'a-really-long-hyphenated-string'. So strToSearch.indexOf('a-really') === 0 is true.