Olivier Chafik
07d3998cdc
function f(a, opts) {
let b = opts && 'b' in opts ? opts.b : null;
let c = opts && 'c' in opts ? opts.c : c_default;
...
After:
function f(a, {b = null, c = c_default} = {}) {
...
Note:
- Still reverting to old code when any parameter clashes with reserved JS names (see discussion in https://github.com/dart-lang/dev_compiler/issues/392)
- When a parameter clashes with a Object.prototype property, using a clean default opts value (Object.create(null)).
- Passing opts through in aliased constructors, both for speed/concision and correctness (since default param value semantic is weird there)
BUG=
R=jmesserly@google.com
Review URL: https://codereview.chromium.org/1484263002 .
66 lines
1.1 KiB
Dart
66 lines
1.1 KiB
Dart
// Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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library methods;
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class A {
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int x() => 42;
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int y(int a) {
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return a;
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}
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int z([num b]) => b;
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int zz([int b = 0]) => b;
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int w(int a, {num b}) {
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return a + b;
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}
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clashWithObjectProperty({constructor}) => constructor;
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clashWithJsReservedName({function}) => function;
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int get a => x();
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void set b(int b) {}
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int _c = 3;
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int get c => _c;
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void set c(int c) {
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_c = c;
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}
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}
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class Bar {
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call(x) => print('hello from $x');
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}
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class Foo {
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final Bar bar = new Bar();
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}
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test() {
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// looks like a method but is actually f.bar.call(...)
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var f = new Foo();
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f.bar("Bar's call method!");
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// Tear-off
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A a = new A();
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var g = a.x;
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// Dynamic Tear-off
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dynamic aa = new A();
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var h = aa.x;
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// Tear-off of object methods
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var ts = a.toString;
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var nsm = a.noSuchMethod;
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// Tear-off extension methods
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var c = "".padLeft;
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var r = (3.0).floor;
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}
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