Web Reference: The lastIndexOf() method returns the index (position) of the last occurrence of a specified value in a string. The lastIndexOf() method searches the string from the end to the beginning. Oct 1, 2025 · The lastIndexOf () method of String values searches this string and returns the index of the last occurrence of the specified substring. It takes an optional starting position and returns the last occurrence of the specified substring at an index less than or equal to the specified number. In this tutorial, you'll learn how to use the JavaScript String lastIndexOf () method to locate the last occurrence of a substring in a string.
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