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The trimStart() method in JavaScript is used to remove whitespace from the beginning of a string. This method does not take any arguments, and returns a new string with the leading whitespace removed.

Here is an example of how the trimStart() method works:

const string1 = '   Hello, world!   ';

const result = string1.trimStart();

// the result will be: 'Hello, world!   '

In the code example above, we first declare a string called string1 that contains the text ' Hello, world! '. This string contains whitespace at the beginning of the string. We then use the trimStart() method to remove the whitespace from the beginning of the string1 string. The trimStart() method does not take any arguments, so we simply call the method on the string1 string without passing any arguments.

As a result of calling the trimStart() method, the result variable will be set to 'Hello, world! ', which is the string1 string with the leading whitespace removed. If the string1 string did not contain any leading whitespace, the result variable would be set to the original string1 string.