| Regular Array | Object/Associate Array |
|---|---|
| // regular array (add an optional integer argument to control array's size) var myCars=new Array(); myCars[0]="Saab"; myCars[1]="Volvo"; myCars[2]="BMW"; |
//Create a direct instance of an object personObj=new Object(); personObj.firstname="John"; personObj.lastname="Doe"; personObj.age=50; personObj.eyecolor="blue"; |
| // create literal array var myCars=["Saab","Volvo","BMW"]; |
//create alternative syntax (using object literals): personObj = {firstname:"John", lastname:"Doe", age:50, eyecolor:"blue"}; |
| // find total length of array document.write(myCars.length); // output: 3 |
Object.size = function(obj) { var size = 0, key; for (key in obj) { if (obj.hasOwnProperty(key)) size++; } return size; }; document.write(Object.size(personObj)); // output: 4 |
| // print individual element of array document.write(myCars[0]); // output: Saab |
document.write(personObj['firstname']); // output: John document.write(personObj.firstname); // output: John |
| // print all elements of array for(var x = 0; x < myCars.length; x++){ document.write(myCars[x] + " "); } // output: Saab Volvo BMW |
var x; for (x in personObj) { document.write(personObj[x] + " "); } // output: John Doe 50 blue |
Refer site:
http://www.w3schools.com/js/js_obj_array.asp
http://www.w3schools.com/js/js_objects.asp
