Source/JavaScriptCore/builtins/ObjectConstructor.js

/*
 * Copyright (C) 2016 Oleksandr Skachkov <gskachkov@gmail.com>.
 * Copyright (C) 2015 Jordan Harband. All rights reserved.
 * Copyright (C) 2018 Yusuke Suzuki <yusukesuzuki@slowstart.org>.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

function entries(object)
{
    "use strict";

    var obj = @toObject(object, "Object.entries requires that input parameter not be null or undefined");
    var names = @Object.@getOwnPropertyNames(obj);
    var properties = [];
    for (var i = 0, length = names.length; i < length; ++i) {
        var name = names[i];
        if (@propertyIsEnumerable(obj, name))
            properties.@push([name, obj[name]]);
    }

    return properties;
}

function fromEntries(iterable)
{
    "use strict";

    let object = {};

    for (let entry of iterable) {
        if (!@isObject(entry))
            @throwTypeError("Object.fromEntries requires the first iterable parameter yields objects");
        let key = entry[0];
        let value = entry[1];
        @putByValDirect(object, key, value);
    }

    return object;
}