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// Copyright (C) 2018 Shilpi Jain and Michael Ficarra. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-array.prototype.flatMap
description: >
Assert behavior if this value has a custom non-object constructor property
info: |
Array.prototype.flatMap ( mapperFunction [ , thisArg ] )
1. Let O be ? ToObject(this value).
2. Let sourceLen be ? ToLength(? Get(O, "length")).
...
5. Let A be ? ArraySpeciesCreate(O, 0).
...
ArraySpeciesCreate ( originalArray, length )
3. Let isArray be ? IsArray(originalArray).
4. If isArray is false, return ? ArrayCreate(length).
5. Let C be ? Get(originalArray, "constructor").
6. If IsConstructor(C) is true, then
a. Let thisRealm be the current Realm Record.
b. Let realmC be ? GetFunctionRealm(C).
c. If thisRealm and realmC are not the same Realm Record, then
i. If SameValue(C, realmC.[[Intrinsics]].[[%Array%]]) is true, set C to undefined.
7. If Type(C) is Object, then
a. Set C to ? Get(C, @@species).
b. If C is null, set C to undefined.
8. If C is undefined, return ? ArrayCreate(length).
9. If IsConstructor(C) is false, throw a TypeError exception.
features: [Array.prototype.flatMap, Symbol]
includes: [compareArray.js]
---*/
assert.sameValue(
typeof Array.prototype.flatMap,
'function',
'The value of `typeof Array.prototype.flatMap` is expected to be "function"'
);
var a = [];
var mapperFn = function() {};
a.constructor = null;
assert.throws(TypeError, function() {
a.flatMap(mapperFn);
}, 'a.flatMap(mapperFn) throws a TypeError exception');
a = [];
a.constructor = 1;
assert.throws(TypeError, function() {
a.flatMap(mapperFn);
}, 'a.flatMap(mapperFn) throws a TypeError exception');
a = [];
a.constructor = 'string';
assert.throws(TypeError, function() {
a.flatMap(mapperFn);
}, 'a.flatMap(mapperFn) throws a TypeError exception');
a = [];
a.constructor = true;
assert.throws(TypeError, function() {
a.flatMap(mapperFn);
}, 'a.flatMap(mapperFn) throws a TypeError exception');
a = [];
a.constructor = Symbol();
assert.throws(TypeError, function() {
a.flatMap(mapperFn);
}, 'a.flatMap(mapperFn) throws a TypeError exception');
a = [];
a.constructor = undefined;
var actual = a.flatMap(mapperFn);
assert.compareArray(actual, [], 'The value of actual is expected to be []');
assert.sameValue(
Object.getPrototypeOf(actual),
Array.prototype,
'Object.getPrototypeOf(a.flatMap(mapperFn)) returns Array.prototype'
);
assert.notSameValue(actual, a, 'The value of actual is expected to not equal the value of `a`');
reportCompare(0, 0);
|
