javascript | Array conversion

Question

I have an array and would like to convert it to another structure.

My array:

["DZ|47", "DZ|48", "DZ|53", "DZ|57", "AR|202", "AR|206", "AR|213", "BY|484", "BY|485", "BY|487"]

And I would like to convert this into:

{"DZ":[47,48,53,57],"AR":[202,206,213],"BY":[484,485,487]}

I'm started to write the code, but...what next?

$.each(arr, function( index, value ) {
 var idx = value.split('|');
 //arr2[idx[0]] = arr3;
});

Thanks!

Answer 1

var result = {};
$.each(arr, function( index, value ) {
 var idx = value.split('|');
 if(!result[idx[0]]){
 result[idx[0]] = [];
 }
 result[idx[0]].push(idx[1]);
});

Answer 2

You can use Array.prototype.reduce method:

var data = ["DZ|47", "DZ|48", "DZ|53", "DZ|57", "AR|202", "AR|206", "AR|213", "BY|484", "BY|485", "BY|487"];
var result = data.reduce(function(prev, curr) {
 var split = curr.split('|');
 if (!prev[split[0]]) prev[split[0]] = [];
 prev[split[0]].push(split[1]); 
 return prev;
}, {});
alert(JSON.stringify(result));