Working with multi-dimensional arrays of various sizes using constants and functions

multi-dimensional.js

var GROUP = 0;
var SUB_GROUP = 1;

...


releases[GROUP];
releases[SUB_GROUP];

function getGroup(data, releaseOffset) {
    return data[GROUP + index];
}

function getNameFromGroup(groupData) {
    return groupData[GROUP_NAME];
}

/// first thing's group it would be 0 + 0
/// first thing's group's subgroup it would be 1 + 0
/// second thing's group it would be 2 + 0
/// second thing's subgroup

var data = [
  [
    [], // thing 1 group
    []
  ],// thing 2 sub-group
  [
    [], // thing 2 group
    []
  ], // thing 2 sub-group
]

data[23][34];