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Created November 22, 2018 13:08
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Group Elements by several matching attributes
function groupBy(array: any[], f): any {
const groups = {};
array.forEach(function (o) {
const group = JSON.stringify(f(o));
groups[group] = groups[group] || [];
return Object.keys(groups).map(function (group) {
return groups[group];
var result = this.groupBy(coordinates, function (item) {
return [item.x, item.y];
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