leftPad implementation

leftPad.js

// ES6 leftPad by Guillermo Rauch
// https://twitter.com/rauchg/status/712799807073419264
export default (v, n, c = '0') => String(v).length >= n ? '' + v : (String(c).repeat(n) + v).slice(-n);

// for ES6 less
function leftPad(v, n, c){
  c = c ? '0' : c;
  return String(v).length >= n ? '' + v : (String(c).repeat(n) + v).slice(-n);
}