string-repeat.js

'use strict';
var toInteger = require('../internals/to-integer');
var requireObjectCoercible = require('../internals/require-object-coercible');

// `String.prototype.repeat` method implementation
// https://tc39.github.io/ecma262/#sec-string.prototype.repeat
module.exports = ''.repeat || function repeat(count) {
  var str = String(requireObjectCoercible(this));
  var result = '';
  var n = toInteger(count);
  if (n < 0 || n == Infinity) throw RangeError('Wrong number of repetitions');
  for (;n > 0; (n >>>= 1) && (str += str)) if (n & 1) result += str;
  return result;
};