src/v8/test/mjsunit/es6/typedarray-fill.js

// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Flags: --allow-natives-syntax

var intArrayConstructors = [
  Uint8Array,
  Int8Array,
  Uint16Array,
  Int16Array,
  Uint32Array,
  Int32Array,
  Uint8ClampedArray
];

var floatArrayConstructors = [
  Float32Array,
  Float64Array
];

var typedArrayConstructors = [...intArrayConstructors, ...floatArrayConstructors];

for (var constructor of typedArrayConstructors) {
  assertEquals(1, constructor.prototype.fill.length);

  assertArrayEquals([], new constructor([]).fill(8));
  assertArrayEquals([8, 8, 8, 8, 8], new constructor([0, 0, 0, 0, 0]).fill(8));
  assertArrayEquals([0, 8, 8, 8, 8], new constructor([0, 0, 0, 0, 0]).fill(8, 1));
  assertArrayEquals([0, 0, 0, 0, 0], new constructor([0, 0, 0, 0, 0]).fill(8, 10));
  assertArrayEquals([8, 8, 8, 8, 8], new constructor([0, 0, 0, 0, 0]).fill(8, -5));
  assertArrayEquals([0, 8, 8, 8, 0], new constructor([0, 0, 0, 0, 0]).fill(8, 1, 4));
  assertArrayEquals([0, 8, 8, 8, 0], new constructor([0, 0, 0, 0, 0]).fill(8, 1, -1));
  assertArrayEquals([0, 8, 8, 8, 8], new constructor([0, 0, 0, 0, 0]).fill(8, 1, 42));
  assertArrayEquals([0, 0, 8, 8, 8], new constructor([0, 0, 0, 0, 0]).fill(8, -3, 42));
  assertArrayEquals([0, 0, 8, 8, 0], new constructor([0, 0, 0, 0, 0]).fill(8, -3, 4));
  assertArrayEquals([0, 0, 0, 8, 0], new constructor([0, 0, 0, 0, 0]).fill(8, -2, -1));
  assertArrayEquals([0, 0, 0, 0, 0], new constructor([0, 0, 0, 0, 0]).fill(8, -1, -3));
  assertArrayEquals([8, 8, 8, 8, 0], new constructor([0, 0, 0, 0, 0]).fill(8, 0, 4));

  assertArrayEquals([0, 0, 0, 0, 0], new constructor([0, 0, 0, 0, 0]).fill(8, Infinity));
  assertArrayEquals([8, 8, 8, 8, 8], new constructor([0, 0, 0, 0, 0]).fill(8, -Infinity));
  assertArrayEquals([8, 8, 8, 8, 8], new constructor([0, 0, 0, 0, 0]).fill(8, 0, Infinity));
  assertArrayEquals([0, 0, 0, 0, 0], new constructor([0, 0, 0, 0, 0]).fill(8, 0, -Infinity));

  // Test exceptions
  assertThrows('constructor.prototype.fill.call(null)', TypeError);
  assertThrows('constructor.prototype.fill.call(undefined)', TypeError);
  assertThrows('constructor.prototype.fill.call([])', TypeError);

  assertArrayEquals([0, 0, 0, 0, 0], new constructor([0, 0, 0, 0, 0]).fill(false));
  assertArrayEquals([1, 1, 1, 1, 1], new constructor([0, 0, 0, 0, 0]).fill(true));
  assertArrayEquals([0, 0, 0, 0, 0], new constructor([0, 0, 0, 0, 0]).fill(null));
  assertArrayEquals([8, 8, 8, 8, 8], new constructor([0, 0, 0, 0, 0]).fill("8"));

  // Test ToNumber
  var n = 1;
  assertArrayEquals([1, 1], new constructor(2).fill({ valueOf() { return n++; } }));
  assertEquals(2, n);
  var s = [];
  var p = new Proxy({}, { get(t,k) { s.push(k.toString()); return Reflect.get(t,k)} });
  new constructor(3).fill(p);
  assertEquals(["Symbol(Symbol.toPrimitive)", "valueOf", "toString", "Symbol(Symbol.toStringTag)"], s);

  // Shadowing length doesn't affect fill, unlike Array.prototype.fill
  var a = new constructor([2, 2]);
  Object.defineProperty(a, 'length', {value: 1});
  a.fill(3);
  assertArrayEquals([3, 3], [a[0], a[1]]);
  Array.prototype.fill.call(a, 4);
  assertArrayEquals([4, 3], [a[0], a[1]]);

  // Detached Operation
  var tmp = {
    [Symbol.toPrimitive]() {
      assertUnreachable("Parameter should not be processed when " +
                        "array.[[ViewedArrayBuffer]] is neutered.");
      return 0;
    }
  };
  var array = new constructor([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
  %ArrayBufferNeuter(array.buffer);
  assertThrows(() => array.fill(tmp), TypeError);
}

for (var constructor of intArrayConstructors) {
  assertArrayEquals([0, 0, 0, 0, 0], new constructor([0, 0, 0, 0, 0]).fill(undefined));
  assertArrayEquals([0, 0, 0, 0, 0], new constructor([0, 0, 0, 0, 0]).fill());
  assertArrayEquals([0, 0, 0, 0, 0], new constructor([0, 0, 0, 0, 0]).fill("abcd"));
}

for (var constructor of floatArrayConstructors) {
  assertArrayEquals([NaN, NaN, NaN, NaN, NaN], new constructor([0, 0, 0, 0, 0]).fill(undefined));
  assertArrayEquals([NaN, NaN, NaN, NaN, NaN], new constructor([0, 0, 0, 0, 0]).fill());
  assertArrayEquals([NaN, NaN, NaN, NaN, NaN], new constructor([0, 0, 0, 0, 0]).fill("abcd"));
}

// Clamping
assertArrayEquals([0, 0, 0, 0, 0], new Uint8ClampedArray([0, 0, 0, 0, 0]).fill(-10));
assertArrayEquals([255, 255, 255, 255, 255], new Uint8ClampedArray([0, 0, 0, 0, 0]).fill(1000));

assertArrayEquals([1, 1, 1, 1, 1], new Uint8ClampedArray([0, 0, 0, 0, 0]).fill(0.50001));
assertArrayEquals([0, 0, 0, 0, 0], new Uint8ClampedArray([0, 0, 0, 0, 0]).fill(0.50000));
assertArrayEquals([0, 0, 0, 0, 0], new Uint8ClampedArray([0, 0, 0, 0, 0]).fill(0.49999));
// Check round half to even
assertArrayEquals([2, 2, 2, 2, 2], new Uint8ClampedArray([0, 0, 0, 0, 0]).fill(1.50000));
assertArrayEquals([2, 2, 2, 2, 2], new Uint8ClampedArray([0, 0, 0, 0, 0]).fill(2.50000));
assertArrayEquals([3, 3, 3, 3, 3], new Uint8ClampedArray([0, 0, 0, 0, 0]).fill(2.50001));
// Check infinity clamping.
assertArrayEquals([0, 0, 0, 0, 0], new Uint8ClampedArray([0, 0, 0, 0, 0]).fill(-Infinity));
assertArrayEquals([255, 255, 255, 255, 255], new Uint8ClampedArray([0, 0, 0, 0, 0]).fill(Infinity));