Checking for unique values in an array

[Madhusudhan GoturKaranam]

Hi,

I have an array which can have dynamic values..Don't know count..
I have to check for uniqueness in that array..

For Example, Array A1 = [1,2,3,3,1]

Here, '3' and '1' is repeated. I should for unique values and giving message if its repeated.

Pls help me..

[Eric Pascarello]

Basically you need to make a second array. Using the number of the firxt array, you add one too it. You need to loop through the whole array.

count[Array1[i]]

use the length property to check the number of elements.

No I am not going to code it!

[Yuriy Fuksenko]

Here is an idea - since you could use the numbers you going to store as array indexes.

so,

var myArray = new Array();
 
function addToArray(number){
   if(myArray[number] && myArray[number]!=null)
   {
       alert("number already exist");
   }
   else{
       myArray[number]=1; 
   }
}

than you could use
for(var i in myArray){ ... }
to loop through array.
Or, you coul have 2 arrays - one for indexes and one for data

 
var indexes = new Array();
var myArray = new Array();
 
function addToArray(number){
   if(indexes[number] && indexes[number]!=null)
   {
       alert("number already exist");
   }
   else{
       indexes[number]=1;
       myArray[myArray.length]=number; 
   }
}