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Extension to Object and Array to allow for easy grouping.
A simple Object and Array extension that allows for easy grouping.
npm install group_by
require('group_by')
var x = [1,2,3,4]
var grouping_key_generator = function(o) {
if(o%2==0)
return 'even';
return 'odd'
}
var groups = x.group_by(grouping_key_generator);
console.log(groups);