How does String.padStart actually work?
Published in
7 min readDec 31, 2017
Previously, I shared my usage of padStart to elegantly replace what would’ve been loads of if statements. This magical method threw me off my rocker. I simply couldn’t believe it existed.
What it does
Mozilla Developer Network (MDN) Docs:
The
padStart()method pads the current string with another string (repeated, if needed) so that the resulting string reaches the given length. The padding is applied from the start (left) of the current string.
Keep prepending a string to another string until the target length is met.
If the length is already less than the original string’s length, nothing happens.
And since padStart returns a string, we can chain its methods.
