Jquery, checking if a value exists in array or not [duplicate]

Question

I believe this question will be fairly easy for the ones who played around with java script / jquery.

var arr = new Array();  $.map(arr, function() {  if (this.id == productID) {    this.price = productPrice;  }else {   arr.push({id: productID, price: productPrice})  } } 

I guess the code above explains what I want in really simple way. I would imagine this $.map would work like this but unfortunately I couldn't get results with this.

What is the most simple and elegant way to do this? Do I truly go through all array just to find if a key's value is there or not?

Does Jquery has something like isset($array['key'])?

EDIT

I tried to use inArray but it keeps adding object to array even if there is a match.

if ( $.inArray(productID, arr) > -1) {    var number = $.inArray(productID, arr);    orderInfo[number].price = parseFloat(productPrice); }else {    orderInfo.push({id:productID, price:parseFloat(productPrice)}); } 

Answer 1

http://api.jquery.com/jQuery.inArray/

if ($.inArray('example', myArray) != -1) {   // found it }