JSTests/test262/test/built-ins/TypedArrayConstructors/internals/DefineOwnProperty/set-value.js

// 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-integer-indexed-exotic-objects-defineownproperty-p-desc
description: >
  Set the value and return true
info: |
  9.4.5.3 [[DefineOwnProperty]] ( P, Desc)
  ...
  3. If Type(P) is String, then
    a. Let numericIndex be ! CanonicalNumericIndexString(P).
    b. If numericIndex is not undefined, then
      ...
      xi. If Desc has a [[Value]] field, then
        1. Let value be Desc.[[Value]].
        2. Return ? IntegerIndexedElementSet(O, intIndex, value).
  ...

  IntegerIndexedElementSet ( O, index, value )

  Assert: O is an Integer-Indexed exotic object.
  If O.[[ContentType]] is BigInt, let numValue be ? ToBigInt(value).
  Otherwise, let numValue be ? ToNumber(value).
  Let buffer be O.[[ViewedArrayBuffer]].
  If IsDetachedBuffer(buffer) is false and ! IsValidIntegerIndex(O, index) is true, then
    Let offset be O.[[ByteOffset]].
    Let arrayTypeName be the String value of O.[[TypedArrayName]].
    Let elementSize be the Element Size value specified in Table 62 for arrayTypeName.
    Let indexedPosition be (ℝ(index) × elementSize) + offset.
    Let elementType be the Element Type value in Table 62 for arrayTypeName.
    Perform SetValueInBuffer(buffer, indexedPosition, elementType, numValue, true, Unordered).
  Return NormalCompletion(undefined).

includes: [testTypedArray.js]
features: [Reflect, TypedArray]
---*/

testWithTypedArrayConstructors(function(TA) {
  var sample = new TA([0, 0]);

  assert.sameValue(
    Reflect.defineProperty(sample, "0", {value: 1}),
    true,
    "set value for sample[0] returns true"
  );

  assert.sameValue(
    Reflect.defineProperty(sample, "1", {value: 2}),
    true,
    "set value for sample[1] returns true"
  );

  assert.sameValue(sample[0], 1, "sample[0]");
  assert.sameValue(sample[1], 2, "sample[1]");
});