Group array items based on variable javascript

Question

I have an array that is created dynamic from an xml document looking something like this:

myArray[0] = [1,The Melting Pot,A]
myArray[1] = [5,Mama\'s Mexican         


        

Answer 1

You have to create an empty JavaScript object and assign an array to it for each letter.

var object = {};

for ( var x = 0; x < myArray.length; x++ )
{
    var letter = myArray[x][2];

    // create array for this letter if it doesn't exist
    if ( ! object[letter] )
    {
        object[letter] = [];
    }

    object[ myArray[x][2] ].push[ myArray[x] ];
}

Demo fiddle here.