Web Reference: Oct 3, 2018 · Fundamentally, if the start position (0 in your example) plus the length of the search string (0) isn't greater than the length of the string you call it on (0), it loops checking code units. Since there are no code units to check, and 0 + 0 isn't greater than 0, the result is 0. Description The indexOf() method returns the position of the first occurrence of a value in a string. The indexOf() method returns -1 if the value is not found. The indexOf() method is case sensitive. Jul 10, 2025 · The method returns the index of the first occurrence of the specified substring at a position greater than or equal to position, which defaults to 0. If position is greater than the length of the calling string, the method doesn't search the calling string at all.
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