Modifying a string in an array using an array variable that has an array in it

Question

I am trying to loop through an array of strings using several for loops to call each array item. I'm having some trouble getting just the right code to pull it off. I have tried using global definitions of arrays and so on.

var An = new Array(            
       "11111100011111",       
       "11111000011111",      
       "11110011001111", 
       "11100000000111", 
       "11001111110011", 
       "10011111111001");  
var Bn = new Array(            
       "1000000001",       
       "1001111001",      
       "1000000001", 
       "1000000001", 
       "1001111001", 
       "1000000001"); 

// This second part sits in a onload function.
var alphabet = "AB".split("");

for (x = 0; x < 6; x++) {       
    for (i = 0; i < 2; i++) {
     var my_object = {};
     my_object = window[alphabet[x] + 'n[' + i + ']'];
     my_object = window[my_object].replace(/0/g, "B");
     my_object = window[my_object].replace(/1/g, "_");
    }
}

What are you trying to achieve? Where do you set name? Why does x go until 6, if you use alphabet[x], and alphabet.length==2? — Oriol
– Oriol, Commented Sep 25, 2014 at 16:41
I'm still not understanding. What significance does alphabet have here? What is window[my_object] supposed to accomplish? Where are you trying to access An and Bn? — gen_Eric
– gen_Eric, Commented Sep 25, 2014 at 16:54
window[alphabet[x] + 'n[' + i + ']']; is wrong and should be window[alphabet[x]+'n'][i]; if at all. However, you shouldn't use window like that, rather define your maps as var arrays = {A:[…],B:[…]} and access them normally there — Bergi
– Bergi, Commented Sep 25, 2014 at 17:01

gen_Eric · Accepted Answer · 2014-09-25 17:03:39Z

What you should do is put An and Bn into an object. This will make it much easier to reference later on.

var alphabet = {
    An: [
       "11111100011111",       
       "11111000011111",      
       "11110011001111", 
       "11100000000111", 
       "11001111110011", 
       "10011111111001"
    ],
    Bn: [
       "1000000001",       
       "1001111001",      
       "1000000001", 
       "1000000001", 
       "1001111001", 
       "1000000001"
    ]
};

Then you pick out the array you want and loop over it.

var arrays = ['A', 'B'];
for(var x = 0, xLen = arrays.length; x < xLen; x++){
    var my_key = arrays[x]+'n';
    for(var i = 0, iLen = alphabet[my_key].length; i < iLen; i++){
        alphabet[my_key][i] = alphabet[my_key][i].replace(/0/g, "B");
        alphabet[my_key][i] = alphabet[my_key][i].replace(/1/g, "_");
    }
}

Actually, for the inner for loop, you can also use Array.map.

var arrays = ['A', 'B'];
for(var x = 0, xLen = arrays.length; x < xLen; x++){
    var my_key = arrays[x]+'n';
    alphabet[my_key] = alphabet[my_key].map(function(val){
        val = val.replace(/0/g, "B");
        val = val.replace(/1/g, "_");
        return val;
    });
}

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