Question

I set an array which have key in string Like below in my code :

 var a = new Array();
 a[1] = new Array();
 a[1]['mystring'] = new Array();
 a[1]['mystring'] = 'test';
 if(isNullValues(a[1])) {
    alert("Array Empty.");
 }
 function isNullValues(data) {
    if (data == undefined || data == null || data.length == 0 || data == "") {
        return true;
     } else {
           return false;
     } 
  }

It alerts me Array Empty string. But it shouldn’t return this?

Answer 1

There are no associative arrays in JavaScript. What you are doing is adding a property “mystring” to the array in a[1]. Hence, the internal counter “length” does not get incremented and a[1].length == 0 is true, therefore “isNullValues()” returns true.

You can “dirty fix” this by using a plain object:

var a = new Array();
a[1] = {};
a[1]['mystring'] = 'test';