text: /* */ 
  var $ = require("./$"),
      ctx = require("./$.ctx"),
      $def = require("./$.def"),
      $iter = require("./$.iter"),
      stepCall = $iter.stepCall;
  $def($def.S + $def.F * !require("./$.iter-detect")(function(iter) {
    Array.from(iter);
  }), 'Array', {from: function from(arrayLike) {
      var O = Object($.assertDefined(arrayLike)),
          mapfn = arguments[1],
          mapping = mapfn !== undefined,
          f = mapping ? ctx(mapfn, arguments[2], 2) : undefined,
          index = 0,
          length,
          result,
          step,
          iterator;
      if ($iter.is(O)) {
        iterator = $iter.get(O);
        result = new (typeof this == 'function' ? this : Array);
        for (; !(step = iterator.next()).done; index++) {
          result[index] = mapping ? stepCall(iterator, f, [step.value, index], true) : step.value;
        }
      } else {
        result = new (typeof this == 'function' ? this : Array)(length = $.toLength(O.length));
        for (; length > index; index++) {
          result[index] = mapping ? f(O[index], index) : O[index];
        }
      }
      result.length = index;
      return result;
    }});
  