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BrunoGiubilei/groupby.js

Created February 14, 2020 16:48
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Group By prototype for array of object
Raw
groupby.js
Array.prototype.groupBy = function() {
var self = this, p = arguments[0];
return self.map(m => m[p.prop])
.reduce((a, d) => {if (!a.includes(d)) { a.push(d); } return a;}, [])
.map(m => self
.filter(f => f[p.prop] === m));
}
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