What is an Object?
It is a set of key and value pairs. You can use any number of keys with any name as long as it is a String. And each key can be associated with any value, those values can be of any Types, such as: Primitive Types, Function Objects and object itself.
The difference:
In case of Objects - values are passed by reference, and the changes are bi-directional:
While in Primitive - the values are passed by value, and the changes are uni-directional:
Fiddle: http://jsfiddle.net/sL6q0742/
It is a set of key and value pairs. You can use any number of keys with any name as long as it is a String. And each key can be associated with any value, those values can be of any Types, such as: Primitive Types, Function Objects and object itself.
var myObject = { a: undefined, //Primitive b: null, //Primitive c: true, //Primitive d: "foo", //Primitive e: 4.33, //Primitive f: function bar() { /**/ }, //Object g: { h: baz } //Object }
The difference:
In case of Objects - values are passed by reference, and the changes are bi-directional:
var a = { x: 1, y: 2} var b = a; console.log(b); // Object {x: 1, y: 2} // b.x = 10; console.log(a.x); // 10 // a.y = 20; console.log(b.y); //20
While in Primitive - the values are passed by value, and the changes are uni-directional:
//Prototype Object var object1 = {x: 11, y: 22}; var object2 = Object.create(object1); console.log(object2); //Object {} // object2.x = 100; console.log(object1.x); //11 console.log(object2.x); //100 // object1.y = 200; console.log(object2.y); //200 console.log(object1.y); //200
Fiddle: http://jsfiddle.net/sL6q0742/
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