Web Reference: Jul 10, 2025 · The indexOf() method of String values searches this string and returns the index of the first occurrence of the specified substring. It takes an optional starting position and returns the first occurrence of the specified substring at an index greater than or equal to the specified number. 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. It mimics the behaviour of String.prototype.indexOf and String.prototype.lastIndexOf methods but they also accept a RegExp as the search argument in addition to a string representing the value to search for.
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String Prototype Indexof Javascript Shorty Net Worth 2026: Salary, Income & Wealth Net Worth & Biography
Estimated Worth: $3M - $10M
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Last Updated: April 7, 2026
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