assign-reuse-propmap.js

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function testBasic() {

    var o1 = {x: 1};

    var o2 = {a: 1, b: 2, c: 3, x: 4, y: 5, z: 6};

    for (var i = 0; i < 4; i++) {

        var to1 = Object.assign({}, o1);

        assertEq(JSON.stringify(to1), '{"x":1}');

        var to2 = Object.assign({}, o2);

        assertEq(JSON.stringify(to2), '{"a":1,"b":2,"c":3,"x":4,"y":5,"z":6}');

testBasic();

// Target object's proto must not be changed by assign.

function testProto() {

    var from = {};

    from.a = 1;

    from.b = 2;

    from.c = 3;

    for (var i = 0; i < 5; i++) {

        var to = Object.assign(Object.create(null), from);

        assertEq(JSON.stringify(to), '{"a":1,"b":2,"c":3}');

        assertEq(Object.getPrototypeOf(to), null);

testProto();

// Target object's realm must not be changed by assign.

function testRealm() {

    var global = newGlobal({sameCompartmentAs: this});

    var from = global.evaluate("({})");

    from.a = 1;

    from.b = 2;

    from.c = 3;

    for (var i = 0; i < 5; i++) {

        var to = Object.assign({}, from);

        assertEq(JSON.stringify(to), '{"a":1,"b":2,"c":3}');

        assertEq(objectGlobal(to), this);

        assertEq(Object.getPrototypeOf(to), Object.prototype);

testRealm();