bug730977-implement-jsop-delprop.js

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function makeThing(i)

    var thing = {};

    thing.foo = i;

    thing.bar = "bar_" + i;

    Object.defineProperty(thing, 'baz', {'configurable':false, 'value':[i]});

    return thing;

function makeArray(count)

    var arr = new Array(count);

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

        arr[i] = makeThing(i);

    return arr;

function delBar(obj)

    assertEq(Object.getOwnPropertyDescriptor(obj, 'bar') === undefined, false);

    assertEq(delete obj.bar, true);

    assertEq(Object.getOwnPropertyDescriptor(obj, 'bar') === undefined, true);

function delBaz(obj)

    var s = delete obj.baz;

    assertEq(Object.getOwnPropertyDescriptor(obj, 'baz') === undefined, false);

    assertEq(delete obj.baz, false);

    assertEq(Object.getOwnPropertyDescriptor(obj, 'baz') === undefined, false);

function delNonexistentThingy(obj)

    assertEq(Object.getOwnPropertyDescriptor(obj, 'thingy') === undefined, true);

    assertEq(delete obj.thingy, true);

    assertEq(Object.getOwnPropertyDescriptor(obj, 'thingy') === undefined, true);

function testDelProp()

    var arr = makeArray(10000);

    for(var i = 0; i < 10000; i++) {

        var obj = arr[i];

        assertEq(Object.getOwnPropertyDescriptor(obj, 'foo') === undefined, false);

        assertEq(delete obj.foo, true);

        assertEq(Object.getOwnPropertyDescriptor(obj, 'foo') === undefined, true);

        delBar(obj);

        delBaz(obj);

        delNonexistentThingy(obj);

testDelProp();