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Support ES2019 Array.prototype.flatMap (#1372)
* feat: implement Array.prototype.flatMap * tests: update test262.properties
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,171 @@ | ||
| // Copyright 2018 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. | ||
| // | ||
| // Taken from https://github.com/v8/v8/blob/main/test/mjsunit/harmony/array-flat-map.js and changed due to Rhino errors | ||
| // TypeError: redeclaration of const input | ||
|
|
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| // Flags: --allow-natives-syntax | ||
| load("testsrc/assert.js"); | ||
|
|
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| let input; | ||
| let result; | ||
|
|
||
| assertEquals(Array.prototype.flatMap.length, 1); | ||
| assertEquals(Array.prototype.flatMap.name, 'flatMap'); | ||
|
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| assertEquals( | ||
| [1, 2, 3, 4].flatMap((element) => [element, element ** 2]), | ||
| [1, 1, 2, 4, 3, 9, 4, 16] | ||
| ); | ||
| assertEquals( | ||
| [1, 2, 3, 4].flatMap((element) => [[element, element ** 2]]), | ||
| [[1, 1], [2, 4], [3, 9], [4, 16]] | ||
| ); | ||
|
|
||
| { | ||
| const elements = new Set([ | ||
| -Infinity, | ||
| -1, | ||
| -0, | ||
| +0, | ||
| +1, | ||
| Infinity, | ||
| null, | ||
| undefined, | ||
| true, | ||
| false, | ||
| '', | ||
| 'foo', | ||
| /./, | ||
| [], | ||
| {}, | ||
| Object.create(null), | ||
| //new Proxy({}, {}), | ||
| Symbol(), | ||
| x => x ** 2, | ||
| String | ||
| ]); | ||
|
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||
| for (let value of elements) { | ||
| assertEquals( | ||
| [value].flatMap((element) => [element, element]), | ||
| [value, value] | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| { | ||
| const array = [42]; | ||
| assertEquals( | ||
| [array].flatMap((element) => [element, element]), | ||
| [array, array] | ||
| ); | ||
| } | ||
|
|
||
| { | ||
| const nonCallables = new Set([ | ||
| -Infinity, | ||
| -1, | ||
| -0, | ||
| +0, | ||
| +1, | ||
| Infinity, | ||
| null, | ||
| undefined, | ||
| true, | ||
| false, | ||
| '', | ||
| 'foo', | ||
| /./, | ||
| [], | ||
| {}, | ||
| Object.create(null), | ||
| //new Proxy({}, {}), | ||
| Symbol(), | ||
| ]); | ||
| for (let nonCallable of nonCallables) { | ||
| assertThrows(() => { | ||
| [].flatMap(nonCallable); | ||
| }, TypeError); | ||
| } | ||
| } | ||
|
|
||
| { | ||
| const object = { | ||
| foo: 42, | ||
| get length() { | ||
| object.foo = 0; | ||
| } | ||
| }; | ||
| result = [object].flatMap((element) => [element, element]); | ||
| //%HeapObjectVerify(result); | ||
| assertEquals(result, [object, object]); | ||
| assertEquals(result[0].foo, 42); | ||
| } | ||
|
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| assertThrows(() => { | ||
| Array.prototype.flatMap.call(null, (element) => element); | ||
| }, TypeError); | ||
| assertThrows(() => { | ||
| Array.prototype.flatMap.call(undefined, (element) => element); | ||
| }, TypeError); | ||
|
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||
| assertEquals( | ||
| Array.prototype.flatMap.call( | ||
| { | ||
| length: 1, | ||
| 0: 'a', | ||
| 1: 'b', | ||
| }, | ||
| (element) => element | ||
| ), | ||
| ['a'] | ||
| ); | ||
| assertEquals( | ||
| Array.prototype.flatMap.call( | ||
| { | ||
| length: 2, | ||
| 0: 'a', | ||
| 1: 'b', | ||
| }, | ||
| (element) => element | ||
| ), | ||
| ['a', 'b'] | ||
| ); | ||
|
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||
| { | ||
| result = [1, 2, 3].flatMap(function() { | ||
| return [this]; | ||
| }, 'abc'); | ||
| assertEquals(true, result[0] == 'abc'); | ||
| assertEquals(true, result[1] == 'abc'); | ||
| assertEquals(true, result[2] == 'abc'); | ||
| } | ||
|
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||
| { | ||
| input = { 0: 'a', 1: 'b', 2: 'c', length: 'wat' }; | ||
| assertEquals(Array.prototype.flatMap.call(input, x => [x]), []); | ||
| } | ||
|
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| { | ||
| let count = 0; | ||
| input = { | ||
| get length() { ++count; return 0; } | ||
| }; | ||
| result = Array.prototype.flatMap.call(input, x => [x]); | ||
| assertEquals(count, 1); | ||
| } | ||
|
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| { | ||
| const descriptor = Object.getOwnPropertyDescriptor( | ||
| Array.prototype, | ||
| 'flatMap' | ||
| ); | ||
| assertEquals(descriptor.value, Array.prototype.flatMap); | ||
| assertEquals(descriptor.writable, true); | ||
| assertEquals(descriptor.enumerable, false); | ||
| assertEquals(descriptor.configurable, true); | ||
| } | ||
|
|
||
| "success"; |
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14
testsrc/org/mozilla/javascript/tests/es2019/ArrayFlatMapTest.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,14 @@ | ||
| /* This Source Code Form is subject to the terms of the Mozilla Public | ||
| * License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | ||
|
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| package org.mozilla.javascript.tests.es2019; | ||
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| import org.mozilla.javascript.Context; | ||
| import org.mozilla.javascript.drivers.LanguageVersion; | ||
| import org.mozilla.javascript.drivers.RhinoTest; | ||
| import org.mozilla.javascript.drivers.ScriptTestsBase; | ||
|
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| @RhinoTest("testsrc/jstests/es2019/array-flat-map.js") | ||
| @LanguageVersion(Context.VERSION_ES6) | ||
| public class ArrayFlatMapTest extends ScriptTestsBase {} |
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