javascript - What is the location of x and y -


what location of x , y in array: 

var = [ [1,2], [x], [3, [y]] ];

i'm bit confused syntax here.
be: 

a[1] = x , a[2][1] = y?

or introduction of new set of square brackets mean instead have: 

a[1][0] = x , a[2][1][0] = y?

let's find out ;)

var = [ [1,2], [x], [3,[y]]];

if write line line:

var = [   [1,2],   // new array index 0 containing 1 , 2 => a[0][0] = 1 , a[0][1] = 2   [x],     // new array index 1 containing x => a[1][0] = x   [3,[y]]  // new array index 2 containing 3 , array containing y a[2][0] = 3 a[2][1][0] = y  ];

in other words, x = a[1][0]


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