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The Javascript string methods trimStart and trimEnd, formerly known as trimLeft and trimRight respectively, are used to remove whitespace from the beginning or end of a string. trimStart removes whitespace from the beginning of a string, while trimEnd removes whitespace from the end. Both methods return a new string with the whitespace removed, and do not modify the original string.

Whitespace includes spaces, tabs, and newline characters. For example, if you have a string " Hello World ", calling trimStart() on it would return "Hello World ". Calling trimEnd() on the same string would return " Hello World". Calling both trimStart() and trimEnd() on the string would result in "Hello World".

These methods are useful for cleaning up user input or data that may contain extraneous whitespace. They are part of the ECMAScript 2019 standard. Prior to their standardization, developers often used regular expressions or other methods to achieve similar results. The older names, trimLeft and trimRight, are still available in some environments for backward compatibility but are deprecated.