I have 3 json arrays, each with information listed in the same format:

Array:
    ID:
    NAME:
    DATA:

    ID:
    NAME:
    DATA:

    etc...

My goal is to combine all 3 arrays into one array, and sort and display by NAME by passing the 3 arrays into a function.

The function I've tried is:

JSCRIPT Call:

// to save time I'm just passing the name of the array, I've tried passing
// the full array name as json[0]['DATA'][array_1][0]['NAME'] as well.

combineNames(['array_1','array_2']);

FUNCTION:

function combineNames(names) {

    var allNames = []

    for (i=0;i<names.length;i++) {
        for (j=0;j<json[0]['DATA'][names[i]].length;j++) {
            allNames.push(json[0]['DATA'][names[i]][j]['NAME']);
        }
    }

    return allNames.sort();
}

The above gives me the error that NAME is null or undefined.

I've also tried using the array.concat function which works when I hard code it:

var names = [];
var allNames = [];

var names = names.concat(json[0]['DATA']['array_1'],json[0]['DATA']['array_2']);

for (i=0;i<names.length;i++) {
    allNames.push(names[i]['NAME']);
}

return allNames.sort();

But I can't figure out how to pass in the arrays into the function (and if possible I would like to just pass in the array name part instead of the whole json[0]['DATA']['array_name'] like I was trying to do in the first function...