v8/test/mjsunit/harmony/computed-property-names.js

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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-computed-property-names
function ID(x) {
return x;
}
(function TestBasicsString() {
var object = {
a: 'A',
['b']: 'B',
c: 'C',
[ID('d')]: 'D',
};
assertEquals('A', object.a);
assertEquals('B', object.b);
assertEquals('C', object.c);
assertEquals('D', object.d);
assertArrayEquals(['a', 'b', 'c', 'd'], Object.keys(object));
})();
(function TestBasicsNumber() {
var object = {
a: 'A',
[1]: 'B',
c: 'C',
[ID(2)]: 'D',
};
assertEquals('A', object.a);
assertEquals('B', object[1]);
assertEquals('C', object.c);
assertEquals('D', object[2]);
// Array indexes first.
assertArrayEquals(['1', '2', 'a', 'c'], Object.keys(object));
})();
(function TestBasicsSymbol() {
var sym1 = Symbol();
var sym2 = Symbol();
var object = {
a: 'A',
[sym1]: 'B',
c: 'C',
[ID(sym2)]: 'D',
};
assertEquals('A', object.a);
assertEquals('B', object[sym1]);
assertEquals('C', object.c);
assertEquals('D', object[sym2]);
assertArrayEquals(['a', 'c'], Object.keys(object));
assertArrayEquals([sym1, sym2], Object.getOwnPropertySymbols(object));
})();
(function TestToNameSideEffects() {
var counter = 0;
var key1 = {
toString: function() {
assertEquals(0, counter++);
return 'b';
}
};
var key2 = {
toString: function() {
assertEquals(1, counter++);
return 'd';
}
};
var object = {
a: 'A',
[key1]: 'B',
c: 'C',
[key2]: 'D',
};
assertEquals(2, counter);
assertEquals('A', object.a);
assertEquals('B', object.b);
assertEquals('C', object.c);
assertEquals('D', object.d);
assertArrayEquals(['a', 'b', 'c', 'd'], Object.keys(object));
})();
(function TestToNameSideEffectsNumbers() {
var counter = 0;
var key1 = {
valueOf: function() {
assertEquals(0, counter++);
return 1;
},
toString: null
};
var key2 = {
valueOf: function() {
assertEquals(1, counter++);
return 2;
},
toString: null
};
var object = {
a: 'A',
[key1]: 'B',
c: 'C',
[key2]: 'D',
};
assertEquals(2, counter);
assertEquals('A', object.a);
assertEquals('B', object[1]);
assertEquals('C', object.c);
assertEquals('D', object[2]);
// Array indexes first.
assertArrayEquals(['1', '2', 'a', 'c'], Object.keys(object));
})();
(function TestDoubleName() {
var object = {
[1.2]: 'A',
[1e55]: 'B',
[0.000001]: 'C',
[-0]: 'D',
// TODO(arv): https://code.google.com/p/v8/issues/detail?id=3815
// [Infinity]: 'E',
// [-Infinity]: 'F',
[NaN]: 'G',
};
assertEquals('A', object['1.2']);
assertEquals('B', object['1e+55']);
assertEquals('C', object['0.000001']);
assertEquals('D', object[0]);
// TODO(arv): https://code.google.com/p/v8/issues/detail?id=3815
// assertEquals('E', object[Infinity]);
// assertEquals('F', object[-Infinity]);
assertEquals('G', object[NaN]);
})();
(function TestGetter() {
var object = {
get ['a']() {
return 'A';
}
};
assertEquals('A', object.a);
object = {
get b() {
assertUnreachable();
},
get ['b']() {
return 'B';
}
};
assertEquals('B', object.b);
object = {
get c() {
assertUnreachable();
},
get ['c']() {
assertUnreachable();
},
get ['c']() {
return 'C';
}
};
assertEquals('C', object.c);
object = {
get ['d']() {
assertUnreachable();
},
get d() {
return 'D';
}
};
assertEquals('D', object.d);
})();
(function TestSetter() {
var calls = 0;
var object = {
set ['a'](_) {
calls++;
}
};
object.a = 'A';
assertEquals(1, calls);
calls = 0;
object = {
set b(_) {
assertUnreachable();
},
set ['b'](_) {
calls++;
}
};
object.b = 'B';
assertEquals(1, calls);
calls = 0;
object = {
set c(_) {
assertUnreachable()
},
set ['c'](_) {
assertUnreachable()
},
set ['c'](_) {
calls++
}
};
object.c = 'C';
assertEquals(1, calls);
calls = 0;
object = {
set ['d'](_) {
assertUnreachable()
},
set d(_) {
calls++
}
};
object.d = 'D';
assertEquals(1, calls);
})();
(function TestDuplicateKeys() {
'use strict';
// ES5 does not allow duplicate keys.
// ES6 does but we haven't changed our code yet.
var object = {
a: 1,
['a']: 2,
};
assertEquals(2, object.a);
})();
(function TestProto() {
var proto = {};
var object = {
__proto__: proto
};
assertEquals(proto, Object.getPrototypeOf(object));
object = {
'__proto__': proto
};
assertEquals(proto, Object.getPrototypeOf(object));
object = {
['__proto__']: proto
};
assertEquals(Object.prototype, Object.getPrototypeOf(object));
assertEquals(proto, object.__proto__);
assertTrue(object.hasOwnProperty('__proto__'));
object = {
[ID('x')]: 'X',
__proto__: proto
};
assertEquals('X', object.x);
assertEquals(proto, Object.getPrototypeOf(object));
})();
(function TestExceptionInName() {
function MyError() {};
function throwMyError() {
throw new MyError();
}
assertThrows(function() {
var o = {
[throwMyError()]: 42
};
}, MyError);
assertThrows(function() {
var o = {
get [throwMyError()]() { return 42; }
};
}, MyError);
assertThrows(function() {
var o = {
set [throwMyError()](_) { }
};
}, MyError);
})();