Web Reference: Basic String Methods Javascript strings are primitive and immutable: All string methods produce a new string without altering the original string. This page provides you with the most commonly used JavaScript string methods that help you manipulate strings effectively. Jul 10, 2025 · Some of the most-used operations on strings are to check their length, to build and concatenate them using the + and += string operators, checking for the existence or location of substrings with the indexOf() method, or extracting substrings with the substring() method.
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