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JerryScript-DCO-1.0-Signed-off-by: Kristof Kosztyo kkosztyo.u-szeged@partner.samsung.com
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// Copyright 2015 Samsung Electronics Co., Ltd. | ||
// Copyright 2015 University of Szeged. | ||
// | ||
// Licensed under the Apache License, Version 2.0 (the "License"); | ||
// you may not use this file except in compliance with the License. | ||
// You may obtain a copy of the License at | ||
// | ||
// http://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
// Unless required by applicable law or agreed to in writing, software | ||
// distributed under the License is distributed on an "AS IS" BASIS | ||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
// See the License for the specific language governing permissions and | ||
// limitations under the License. | ||
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// Example where we create an object with a couple of sample properties. | ||
// (Note that the second parameter maps keys to *property descriptors*.) | ||
var o = Object.create(Object.prototype, { | ||
// foo is a regular 'value property' | ||
foo: { writable: true, configurable: true, value: 'hello' }, | ||
// bar is a getter-and-setter (accessor) property | ||
bar: { | ||
configurable: false, | ||
get: function() { return 10; }, | ||
set: function(value) { console.log('Setting `o.bar` to', value); } | ||
} | ||
}); | ||
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// create a new object whose prototype is a new, empty object | ||
// and a adding single property 'p', with value 42 | ||
var o = Object.create({}, { p: { value: 42 } }); | ||
// by default properties ARE NOT writable, enumerable or configurable: | ||
o.p = 24; | ||
assert (o.p === 42); | ||
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// to specify an ES3 property | ||
var o2 = Object.create({}, { | ||
p: { | ||
value: 42, | ||
writable: true, | ||
enumerable: true, | ||
configurable: true | ||
} | ||
}); | ||
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assert (o2.p === 42); | ||
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// Shape - superclass | ||
function Shape() { | ||
this.x = 0; | ||
this.y = 0; | ||
} | ||
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// superclass method | ||
Shape.prototype.move = function(x, y) { | ||
this.x += x; | ||
this.y += y; | ||
}; | ||
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// Rectangle - subclass | ||
function Rectangle() { | ||
Shape.call(this); // call super constructor. | ||
} | ||
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// subclass extends superclass | ||
Rectangle.prototype = Object.create(Shape.prototype); | ||
Rectangle.prototype.constructor = Rectangle; | ||
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var rect = new Rectangle(); | ||
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assert (rect instanceof Rectangle); | ||
assert (rect instanceof Shape); | ||
rect.move(1, 1); | ||
assert (rect.x === 1) | ||
assert (rect.y === 1); | ||
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var obj = { | ||
protoFunction: function() { | ||
return 3; | ||
} | ||
}; | ||
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Object.defineProperties(obj, { | ||
"foo": { | ||
value: 42, | ||
writable: true, | ||
}, | ||
"a": { | ||
value: "b", | ||
configurable: true | ||
}, | ||
"bar": { | ||
get: function() { | ||
return this.foo; | ||
}, | ||
}, | ||
}); | ||
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var obj2 = Object.create(obj); | ||
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assert (obj2.protoFunction() === 3); | ||
assert (obj2.foo === 42); | ||
assert (obj2.a === "b"); | ||
assert (obj2.bar === 42); | ||
assert (Object.getPrototypeOf (obj2) === obj); | ||
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var props = { | ||
prop1: { | ||
value: 1, | ||
}, | ||
hey: function () { | ||
return "ho"; | ||
} | ||
}; | ||
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var obj3 = Object.create(obj, props); | ||
assert (obj3.prop1 === 1); | ||
assert (obj3.protoFunction()); | ||
try { | ||
assert (obj3.hey === undefined); | ||
obj3.hey(); | ||
assert (false); | ||
} catch (e) { | ||
assert (e instanceof TypeError); | ||
} | ||
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// Create an object with null as prototype | ||
var obj = Object.create(null) | ||
assert (typeof (obj) === "object"); | ||
// FIXME: enable this assertion after the #208 is fixed. | ||
// assert (Object.getPrototypeOf (obj) === null); | ||
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try { | ||
Object.create() | ||
assert (false); | ||
} catch (e) { | ||
assert (e instanceof TypeError); | ||
} | ||
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try { | ||
Object.create(undefined) | ||
assert (false); | ||
} catch (e) { | ||
assert (e instanceof TypeError); | ||
} |