GroupBy property value within an array #Javascript

groupBy_array-of-properties.js

//src: https://www.consolelog.io/group-by-in-javascript

Array.prototype.groupBy = function(prop) {
  return this.reduce(function(groups, item) {
    var val = item[prop];
    groups[val] = groups[val] || [];
    groups[val].push(item);
    return groups;
  }, {});
}

/*
  Usage:
var array = [{property: "value1", prop2 : "value2"},{property: "value1", prop2 : "value2"},{property: "value2", prop2 : "value1"},{property: "value2", prop2 : "value1"}]

array.groupBy("prop2")


*/