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Diffstat (limited to 'tools/addon-sdk-1.5/packages/api-utils/lib/utils/object.js')
-rw-r--r-- | tools/addon-sdk-1.5/packages/api-utils/lib/utils/object.js | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/tools/addon-sdk-1.5/packages/api-utils/lib/utils/object.js b/tools/addon-sdk-1.5/packages/api-utils/lib/utils/object.js new file mode 100644 index 0000000..165aa0b --- /dev/null +++ b/tools/addon-sdk-1.5/packages/api-utils/lib/utils/object.js @@ -0,0 +1,46 @@ +/* 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/. */ + +"use strict"; + +/** + * Merges all the properties of all arguments into first argument. If two or + * more argument objects have own properties with the same name, the property + * is overridden, with precedence from right to left, implying, that properties + * of the object on the left are overridden by a same named property of the + * object on the right. + * @examples + * var a = { bar: 0, a: 'a' } + * var b = merge(a, { foo: 'foo', bar: 1 }, { foo: 'bar', name: 'b' }); + * b === a // true + * b.a // 'a' + * b.foo // 'bar' + * b.bar // 1 + * b.name // 'b' + */ +function merge(source) { + let descriptor = {}; + Array.slice(arguments, 1).forEach(function onEach(properties) { + Object.getOwnPropertyNames(properties).forEach(function(name) { + descriptor[name] = Object.getOwnPropertyDescriptor(properties, name); + }); + }); + return Object.defineProperties(source, descriptor); +} +exports.merge = merge; + +/** + * Returns an object that inherits from the first argument and contains all the + * properties from all following arguments. + * `extend(source1, source2, source3)` is equivalent of + * `merge(Object.create(source1), source2, source3)`. + */ +function extend(source) { + let rest = Array.slice(arguments, 1); + rest.unshift(Object.create(source)); + return merge.apply(null, rest); +} +exports.extend = extend; + + |