JavaScript Tips — Left padding strings using padStart

The String padStart method adds characters to the start of a string until it is of a given length. You may also here this called left pad, and Python calls this rjust.

The first argument to padStart specifies the desired string length. padStart will add zero or more characters to the start of the string until it of this length

The second argument is optional. It specifies the string used for padding. padStart(7, '0') will add '0' characters to the start of the string until its length is 7

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