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Add characters to the beginning of a string if it’s less than a certain length. Accepts two arguments: the length the string should be, and what characters to add if it’s not that length. The characters to use is optional, and defaults to a space ().

// Add a leading zero for hours below 10
let hour3 = '3';
let hour12 = '12';

// returns "03"
hour3.padStart(2, '0');

// returns "12"
hour12.padStart(2, '0');