Javascript Variable Variables

I seem to remember doing this in the past and stuck.
I have variables being created throughout the page like something_1 = one.  I am trying to put two variables together like 'something_' and '1' to return the value of the variable, 'something_1'
<!DOCTYPE html>
<html>
<head>
<script src="//code.jquery.com/jquery-1.9.1.min.js"></script>
  <script>
    $(function(){
    var x = 'something_';
    var y = '1';
    var z = x+y
alert(z); // should be 'one' but is 'something_1'

})
  </script>
  <meta charset="utf-8">
  <title>testing</title>
</head>
<body>
  <script>var something_1 = 'one';</script>
  <script>var something_2 = 'two';</script>
</body>
</html>

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Scott Fell,  EE MVEDeveloperAsked:
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GaryConnect With a Mentor Commented:
something_1="Hello";    
y = '1';
alert(window['something_'+y]);

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leakim971PluritechnicianCommented:
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leakim971PluritechnicianCommented:
else : http://jsfiddle.net/auy1dewL/1/
    $(function(){
        var x = 'something_';
        var y = '1';
        window[x+y] = "10"; // global variable
        alert(something_1); // 10
    });

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leakim971PluritechnicianCommented:
or : http://jsfiddle.net/auy1dewL/2/
    $(function(){
        var ns = {};
        var x = 'something_';
        var y = '1';
        ns[x+y] = "10";
        alert(ns.something_1); // 10
        alert(ns["something_1"]); // 10
    });

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Scott Fell, EE MVEDeveloperAuthor Commented:
Thank you Leakim.  I think you missed what I was after.  The variable something_1 was already defined.   You both helped though.

http://jsbin.com/vutaco/1/
<!DOCTYPE html>
<html>
<head>
<script src="//code.jquery.com/jquery-1.9.1.min.js"></script>
  <script>
 $(function(){
        var ns = {};
        var x = 'something_';
        var y = '1';
        
        alert(window['something_'+y]);
    });
  </script>
  <meta charset="utf-8">
  <title>testing</title>
</head>
<body>
  <script>var something_1 = 'one';</script>
  <script>var something_2 = 'two';</script>
</body>
</html>

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Scott Fell, EE MVEDeveloperAuthor Commented:
This is the final use case in datatables to dynamically inject a new row

http://live.datatables.net/veqigohe/1/edit
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leakim971PluritechnicianCommented:
this is what I'm showind ID: 40391141
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