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. All string methods return a new value. They do not change the original string. HTML wrapper methods return a string wrapped inside an HTML tag. These are not standard methods, and may not work as expected. The HTML wrapper methods are deprecated in JavaScript. To learn more about String, please check out the JavaScript strings chapter. The following table lists the standard properties of the String object. Returns the length of a string. Allows you to add new properties and methods to an String object.
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