text: 'use strict';
  var bind = require('../internals/function-bind-context');
  var call = require('../internals/function-call');
  var toObject = require('../internals/to-object');
  var callWithSafeIterationClosing = require('../internals/call-with-safe-iteration-closing');
  var isArrayIteratorMethod = require('../internals/is-array-iterator-method');
  var isConstructor = require('../internals/is-constructor');
  var lengthOfArrayLike = require('../internals/length-of-array-like');
  var createProperty = require('../internals/create-property');
  var getIterator = require('../internals/get-iterator');
  var getIteratorMethod = require('../internals/get-iterator-method');
  
  // `Array.from` method implementation
  // https://tc39.es/ecma262/#sec-array.from
  module.exports = function from(arrayLike /* , mapfn = undefined, thisArg = undefined */) {
    var O = toObject(arrayLike);
    var IS_CONSTRUCTOR = isConstructor(this);
    var argumentsLength = arguments.length;
    var mapfn = argumentsLength > 1 ? arguments[1] : undefined;
    var mapping = mapfn !== undefined;
    if (mapping) mapfn = bind(mapfn, argumentsLength > 2 ? arguments[2] : undefined);
    var iteratorMethod = getIteratorMethod(O);
    var index = 0;
    var length, result, step, iterator, next, value;
    // if the target is not iterable or it's an array with the default iterator - use a simple case
    if (iteratorMethod && !(this == Array && isArrayIteratorMethod(iteratorMethod))) {
      iterator = getIterator(O, iteratorMethod);
      next = iterator.next;
      result = IS_CONSTRUCTOR ? new this() : [];
      for (;!(step = call(next, iterator)).done; index++) {
        value = mapping ? callWithSafeIterationClosing(iterator, mapfn, [step.value, index], true) : step.value;
        createProperty(result, index, value);
      }
    } else {
      length = lengthOfArrayLike(O);
      result = IS_CONSTRUCTOR ? new this(length) : Array(length);
      for (;length > index; index++) {
        value = mapping ? mapfn(O[index], index) : O[index];
        createProperty(result, index, value);
      }
    }
    result.length = index;
    return result;
  };
  