shaunwallace

var obj11 = Object.create(Object.prototype, {

    foo : {
        value : 27
    }, 
    bar : {
        value : 39,
            enumerable : true
        }
    });

shaunwallace

var obj10 = {
    x : 1,
    y : 2,
    z : 3
};

var arr1 = ['a', 'b', 'c'];

Object.keys( obj10 ); // returns ["x", "y", "z"]
Object.keys( arr1 ); // returns ["0", "1", "2"]

shaunwallace

var obj8 = {};

Object.defineProperties(obj8, {
    foo : {
        value : 100,
        configurable : false,
        enumerable : true
    },
    bar : {
        value : 300,

shaunwallace

var obj8 = {};

Object.defineProperties(obj8, {
    foo : {
        value : 100,
        configurable : false,
        enumerable : true
    },
    bar : {
        value : 300,

shaunwallace

var obj4 = {}; // create a new empty object

Object.defineProperty(obj4, 'x', {
    value : 'Some generic string',
    writable : true,
    enumerable : true,
    configurable : true
});

obj4.x; // returns "Some generic string"

shaunwallace

// Object.getPrototypeOf(obj);
var obj = Object.create({}); // creates an empty object and is equivalent to obj = {} or obj = Object.create(Object.prototype)
var obj1 = {
    foo : 1,
    bar : function() {
        return 'Bar method called';
    }
};

var obj3 = Object.create(obj1, {

shaunwallace

/* 
    Object.create();

    creates a new object with the specified prototype object and properties
    object.create(proto[, propertiesObject]);

*/
var obj = Object.create({}); // creates an empty object and is equivalent to obj = {} or obj = Object.create(Object.prototype)
var obj1 = {
    foo : 1,

shaunwallace

// this would not work since unnamed functions could not be passed and then called again inside of themselves
[1,2,3,4,5].map(function (n) {
    return !(n > 1) ? 1 : /* what goes here? */ (n - 1) * n;
});

// arguments.callee was added so you could do the following
[1,2,3,4,5].map(function (n) {
    return !(n > 1) ? 1 : arguments.callee(n - 1) * n;
});

shaunwallace

// the following will all throw errors
eval = true;
arguments++;
++eval;
var eval;
function arguments();
function eval();

shaunwallace

var foo = true;
var evalFoo = eval("'use strict'; var foo = false;");
assert( foo === true );
assert ( evalFoo === false );