core-js/internals/string-repeat.js

Standard library

'use strict';
var toIntegerOrInfinity = require('../internals/to-integer-or-infinity');
var toString = require('../internals/to-string');
var requireObjectCoercible = require('../internals/require-object-coercible');

var $RangeError = RangeError;
var floor = Math.floor;

// `String.prototype.repeat` method implementation
// https://tc39.es/ecma262/#sec-string.prototype.repeat
module.exports = function repeat(count) {
  var str = toString(requireObjectCoercible(this));
  var result = '';
  var n = toIntegerOrInfinity(count);
  if (n < 0 || n === Infinity) throw new $RangeError('Wrong number of repetitions');
  for (;n > 0; (n = floor(n / 2)) && (str += str)) if (n % 2) result += str;
  return result;
};