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// Copyright 2014 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: --harmony-arrays
(function() {
assertEquals(1, Array.from.length);
function assertArrayLikeEquals(value, expected, type) {
assertInstanceof(value, type);
assertEquals(expected.length, value.length);
for (var i=0; i<value.length; ++i) {
assertEquals(expected[i], value[i]);
}
}
// Assert that constructor is called with "length" for array-like objects
var myCollectionCalled = false;
function MyCollection(length) {
myCollectionCalled = true;
assertEquals(1, arguments.length);
assertEquals(5, length);
}
Array.from.call(MyCollection, {length: 5});
assertTrue(myCollectionCalled);
// Assert that calling mapfn with / without thisArg in sloppy and strict modes
// works as expected.
var global = this;
function non_strict(){ assertEquals(global, this); }
function strict(){ "use strict"; assertEquals(void 0, this); }
function strict_null(){ "use strict"; assertEquals(null, this); }
Array.from([1], non_strict);
Array.from([1], non_strict, void 0);
Array.from([1], non_strict, null);
Array.from([1], strict);
Array.from([1], strict, void 0);
Array.from([1], strict_null, null);
function testArrayFrom(thisArg, constructor) {
assertArrayLikeEquals(Array.from.call(thisArg, [], undefined), [],
constructor);
assertArrayLikeEquals(Array.from.call(thisArg, NaN), [], constructor);
assertArrayLikeEquals(Array.from.call(thisArg, Infinity), [], constructor);
assertArrayLikeEquals(Array.from.call(thisArg, 10000000), [], constructor);
assertArrayLikeEquals(Array.from.call(thisArg, 'test'), ['t', 'e', 's', 't'],
constructor);
assertArrayLikeEquals(Array.from.call(thisArg,
{ length: 1, '0': { 'foo': 'bar' } }), [{'foo': 'bar'}], constructor);
assertArrayLikeEquals(Array.from.call(thisArg,
{ length: -1, '0': { 'foo': 'bar' } }), [], constructor);
assertArrayLikeEquals(Array.from.call(thisArg,
[ 'foo', 'bar', 'baz' ]), ['foo', 'bar', 'baz'], constructor);
var kSet = new Set(['foo', 'bar', 'baz']);
assertArrayLikeEquals(Array.from.call(thisArg, kSet), ['foo', 'bar', 'baz'],
constructor);
var kMap = new Map(['foo', 'bar', 'baz'].entries());
assertArrayLikeEquals(Array.from.call(thisArg, kMap),
[[0, 'foo'], [1, 'bar'], [2, 'baz']], constructor);
function* generator() {
yield 'a';
yield 'b';
yield 'c';
}
assertArrayLikeEquals(Array.from.call(thisArg, generator()),
['a', 'b', 'c'], constructor);
// Mozilla:
// Array.from on a string handles surrogate pairs correctly.
var gclef = "\uD834\uDD1E"; // U+1D11E MUSICAL SYMBOL G CLEF
assertArrayLikeEquals(Array.from.call(thisArg, gclef), [gclef], constructor);
assertArrayLikeEquals(Array.from.call(thisArg, gclef + " G"),
[gclef, " ", "G"], constructor);
assertArrayLikeEquals(Array.from.call(thisArg, 'test', function(x) {
return this.filter(x);
}, {
filter: function(x) { return x.toUpperCase(); }
}), ['T', 'E', 'S', 'T'], constructor);
assertArrayLikeEquals(Array.from.call(thisArg, 'test', function(x) {
return x.toUpperCase();
}), ['T', 'E', 'S', 'T'], constructor);
assertThrows(function() { Array.from.call(thisArg, null); }, TypeError);
assertThrows(function() { Array.from.call(thisArg, undefined); }, TypeError);
assertThrows(function() { Array.from.call(thisArg, [], null); }, TypeError);
assertThrows(function() { Array.from.call(thisArg, [], "noncallable"); },
TypeError);
var nullIterator = {};
nullIterator[Symbol.iterator] = null;
assertArrayLikeEquals(Array.from.call(thisArg, nullIterator), [],
constructor);
var nonObjIterator = {};
nonObjIterator[Symbol.iterator] = function() { return "nonObject"; };
assertThrows(function() { Array.from.call(thisArg, nonObjIterator); },
TypeError);
assertThrows(function() { Array.from.call(thisArg, [], null); }, TypeError);
// Ensure iterator is only accessed once, and only invoked once
var called = false;
var arr = [1, 2, 3];
var obj = {};
// Test order --- only get iterator method once
function testIterator() {
assertFalse(called, "@@iterator should be called only once");
called = true;
assertEquals(obj, this);
return arr[Symbol.iterator]();
}
var getCalled = false;
Object.defineProperty(obj, Symbol.iterator, {
get: function() {
assertFalse(getCalled, "@@iterator should be accessed only once");
getCalled = true;
return testIterator;
},
set: function() {
assertUnreachable("@@iterator should not be set");
}
});
assertArrayLikeEquals(Array.from.call(thisArg, obj), [1, 2, 3], constructor);
}
function Other() {}
var boundFn = (function() {}).bind(Array, 27);
testArrayFrom(Array, Array);
testArrayFrom(null, Array);
testArrayFrom({}, Array);
testArrayFrom(Object, Object);
testArrayFrom(Other, Other);
testArrayFrom(Math.cos, Array);
testArrayFrom(Math.cos.bind(Math), Array);
testArrayFrom(boundFn, boundFn);
})();
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