fun-apply-null-undefined.js

Enable keyboard shortcuts

function testBasic() {

    var thisVal = {};

    var arr = [1, 2, 3];

    var f = function() {

        assertEq(this, thisVal);

        assertEq(arguments.length, 0);

        return 456;

};

    for (var i = 0; i < 100; i++) {

        // Scripted callee.

        assertEq(f.apply(thisVal), 456);

        assertEq(f.apply(thisVal), 456);

        assertEq(f.apply(thisVal, null), 456);

        assertEq(f.apply(thisVal, undefined), 456);

        // Native callee.

        assertEq(Math.abs.apply(), NaN);

        assertEq(Math.abs.apply(null), NaN);

        assertEq(Math.abs.apply(null, null), NaN);

        assertEq(Array.prototype.join.apply(arr), "1,2,3");

        assertEq(Array.prototype.join.apply(arr, null), "1,2,3");

        assertEq(Array.prototype.join.apply(arr, undefined), "1,2,3");

testBasic();

function testUndefinedGuard() {

    var f = function() { return arguments.length; }

    var arr = [-5, 5];

    for (var i = 0; i < 100; i++) {

        var args = i < 50 ? undefined : arr;

        assertEq(f.apply(null, args), i < 50 ? 0 : 2);

        assertEq(Math.abs.apply(null, args), i < 50 ? NaN : 5);

testUndefinedGuard();