Web Reference: 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. Basic String Methods Javascript strings are primitive and immutable: All string methods produce a new string without altering the original string. Search for text within strings using indexOf, includes, and search methods. Access individual characters and their codes using charAt, charCodeAt, and bracket notation. Check if strings start or end with specific substrings. Extract portions of strings using slice, substring, and substr methods.
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