8023c9f564
Implements code generation for arrow functions by desugaring them into a FunctionLiteral. For the moment, a normal FUNCTION_SCOPE is used, so "this" and "arguments" behave as in normal functions. Implementing the correct scoping rules is to be done later on. BUG=v8:2700 LOG= R=rossberg@chromium.org Review URL: https://codereview.chromium.org/382893003 git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22495 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
49 lines
1.6 KiB
JavaScript
49 lines
1.6 KiB
JavaScript
// Copyright 2014 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --harmony-arrow-functions
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// Arrow functions are like functions, except they throw when using the
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// "new" operator on them.
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assertEquals("function", typeof (() => {}));
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assertEquals(Function.prototype, Object.getPrototypeOf(() => {}));
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assertThrows("new (() => {})", TypeError);
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// Check the different syntax variations
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assertEquals(1, (() => 1)());
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assertEquals(2, (a => a + 1)(1));
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assertEquals(3, (() => { return 3; })());
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assertEquals(4, (a => { return a + 3; })(1));
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assertEquals(5, ((a, b) => a + b)(1, 4));
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assertEquals(6, ((a, b) => { return a + b; })(1, 5));
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// The following are tests from:
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// http://wiki.ecmascript.org/doku.php?id=harmony:arrow_function_syntax
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// Empty arrow function returns undefined
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var empty = () => {};
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assertEquals(undefined, empty());
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// Single parameter case needs no parentheses around parameter list
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var identity = x => x;
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assertEquals(empty, identity(empty));
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// No need for parentheses even for lower-precedence expression body
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var square = x => x * x;
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assertEquals(9, square(3));
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// Parenthesize the body to return an object literal expression
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var key_maker = val => ({key: val});
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assertEquals(empty, key_maker(empty).key);
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// Statement body needs braces, must use 'return' explicitly if not void
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var evens = [0, 2, 4, 6, 8];
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assertEquals([1, 3, 5, 7, 9], evens.map(v => v + 1));
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var fives = [];
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[1, 2, 3, 4, 5, 6, 7, 8, 9, 10].forEach(v => {
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if (v % 5 === 0) fives.push(v);
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});
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assertEquals([5, 10], fives);
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