Javascript consuming variables when variable a = variable b

I have a script setup like this ( var countFull = new Array(0,1,2,3,4,5,6); var countActive = new Array(0,1,2,3,4,5,6); function pickRandom(a) { if(arguments[1].length == 0) { arguments[1] = arguments[0]; } var m = Math.floor(Math.random()*arguments[1].length); chosen = arguments[1].splice(m,1); return chosen; } setInterval(function() { pickRandom(countFull,countActive); }, 1000); When I run this I want the variable to be set for that function only. Instead it is affecting countFull towards the end because I make arguments[1] = arguments[0]. How in javascript can I just reference a variable but not consume it and ultimately arguments[1] becomes arguments[0]. Hope this makes sense. This is driving me nuts how different javascript variables are compared to other languages like PHP.

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