text: // Copyright (C) 2016 the V8 project authors. All rights reserved.
  // This code is governed by the BSD license found in the LICENSE file.
  /*---
  esid: sec-%typedarray%.from
  description: >
    Assert mapfn `this` without thisArg
  info: >
    22.2.2.1 %TypedArray%.from ( source [ , mapfn [ , thisArg ] ] )
  
    ...
    5. If thisArg was supplied, let T be thisArg; else let T be undefined.
    ...
    10. Repeat, while k < len
      ...
      c. If mapping is true, then
        i. Let mappedValue be ? Call(mapfn, T, « kValue, k »).
    ...
  includes: [testTypedArray.js]
  flags: [onlyStrict]
  ---*/
  
  var source = [42, 43];
  
  testWithTypedArrayConstructors(function(TA) {
    var results = [];
    var mapfn = function() {
      results.push(this);
    };
  
    TA.from(source, mapfn);
  
    assert.sameValue(results.length, 2);
    assert.sameValue(results[0], undefined);
    assert.sameValue(results[1], undefined);
  });
  