How to extract value from an array of array

Question

I have an array of array stored. I need to extract the particular value from this arrays.

e.g allarray contain the list of arrays allarray= [Array[3],Array[3],Array[3]]

Answer 1

This is what the Array.prototype.map function is for:

var arr = [["a1","b1","c1"],["a2","b2","c2"],["a3","b3","c3"]];

var theValues = arr.map(function(inner) {return inner[2]});

alert(theValues.join(', '));