How to access an element in an array, within an array, within another array...in JavaScript

Question

I'm trying to call an element in an array, that is in another array, that is in yet another array. for example....

  var a1 = ["1","2","3"];
  var a2 = ["4","5","6"];
  var a3 = ["7","8","9"];
  var a4 = ["10","11","12"];

  var b1 = ["a1","a2"];
  var b2 = ["a3","a4"];

  var c = ["b1","b2"];

  var x = c[0];

  console.log(x);

The answer is x = b1

How can I define the var x = c[0] b1[1] a2[2] so that the answer would be 6?

if you want a1 to be an element of b1, don't put a1 in quotes — MikeB, Oct 04 '12 at 21:56
I trying to learn the best way to do something like this. I haven't had a lot of experience with arrays. — William Smith, Oct 04 '12 at 21:57
take a look at this http://stackoverflow.com/questions/688097/objects-vs-arrays-in-javascript-for-key-value-pairs — Liviu T., Oct 04 '12 at 21:58

score 0 · Answer 1 · answered Oct 04 '12 at 21:57

0

define the arrays as elements of the other arrays, rather than strings:

var a1 = [1, 2, 3];
...
var b1 = [a1, a2];
...
var c = [b1, b2];

var x = c[0][0][0]; // 1

answered Oct 04 '12 at 21:57

jbabey

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score 0 · Answer 2 · answered Oct 04 '12 at 21:58

The array a1 isn't actually in b1 — there's just a string containing the text "a1". If you defined them like so:

var a1 = ["1","2","3"];
var a2 = ["4","5","6"];
var a3 = ["7","8","9"];
var a4 = ["10","11","12"];

var b1 = [a1, a2];
var b2 = [a3, a4];

var c = [b1, b2];

Then you could get "6" by writing c[0][1][2].

score 0 · Accepted Answer · answered Oct 04 '12 at 21:58

0

What you want are nested arrays.

var a1 = ["1","2","3"];
var a2 = ["4","5","6"];
var a3 = ["7","8","9"];
var a4 = ["10","11","12"];

var b1 = [a1,a2];
var b2 = [a3,a4];

var c = [b1,b2];

var x = c[0][1][2];

console.log(x);

answered Oct 04 '12 at 21:58

saml

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The Alpha · Answer 4 · 2012-10-04T22:07:08.527

0

var a1 = ["1","2","3"], a2 = ["4","5","6"], a3 = ["7","8","9"], a4 = ["10","11","12"];
var b1 = [a1,a2];
var b2 = [a3,a4];
var c = [b1,b2];

var x1 = c[0][0][0];
var x2 = c[0][0][1];
var x3 = c[0][0][2];

console.log(x1); //1 (1st/0 item of a1) from c
console.log(x2); //2 (2nd/1 item of a1) from c
console.log(x3); //3 (3rd/2 item of a1) from c

DEMO.

edited Oct 04 '12 at 22:07

answered Oct 04 '12 at 22:00

The Alpha

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How to access an element in an array, within an array, within another array...in JavaScript

4 Answers4