javascript - Capturing variable names from a select -

in end have written code reads through file , outputs list of javascript arrays example, page see:

<script>   var peanuts = ["1","s","g","3","n"];   var cashewnuts = ["d","a","f","d","n"];   var pecannuts = ["6","m","3","x","m"];   var brazilnuts = ["j","n","7","v","s"];   var goingnuts = ["a","e","7","m","y"]; </script> 

i want use array based on value of somewhere else in page.

so example:

if($('select').val()===0){    alert(firstarray[1]); } 

my issue variable names decided on contained in read file, can't know information. there way example

//collect value select , assign var var varn = $('select').val(); //then collect variable has variable name  //equals value of 'varn' 

i know seems horrendous unfortunately based on need do, need :(

yes. if example vars in global scope, can do

var val = window[varn][0]; peanuts:1

if

var nuts = {   peanuts : ["1","s","g","3","n"],   cashewnuts : ["d","a","f","d","n"],   pecannuts : ["6","m","3","x","m"],   brazilnuts : ["j","n","7","v","s"],   goingnuts : ["a","e","7","m","y"] } 

then can use

var val = nuts[varn][0];