Web Reference: Basic String Methods Javascript strings are primitive and immutable: All string methods produce a new string without altering the original string. 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. Aug 14, 2025 · JavaScript provides a variety of built-in methods to work with strings — allowing you to extract, modify, search, and format text with ease. Below are some of the most commonly used core string methods:
YouTube Excerpt: 00:00:00 intro 00:00:28 .charAt() 00:01:34 .indexOf() 00:02:03 .lastIndexOf() 00:02:15 .length 00:02:40 .trim() 00:03:13 .
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