37 lines
1.1 KiB
JavaScript
37 lines
1.1 KiB
JavaScript
/**
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* Part of [Canivete](http://canivete.leofavre.com/#deepgroupby)
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*
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* Groups the contents of an array by one or more iteratees.
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* Unlike Lodash [`groupBy()`](https://lodash.com/docs/4.17.4#groupBy),
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* this function can create nested groups, but cannot receive
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* strings for iteratees.
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*/
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const groupBy = (e, ...t) => {
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let r = e.map((e) => t.map((t) => t(e))),
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a = {};
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return (
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r.forEach((t, r) => {
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let l = (_simpleAt(a, t) || []).concat([e[r]]);
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_simpleSet(a, t, l);
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}),
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a
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);
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},
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_isPlainObject = (e) =>
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null != e && "object" == typeof e && e.constructor == Object,
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_parsePath = (e) => (Array.isArray(e) ? e : `${e}`.split(".")),
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_simpleAt = (e, t) =>
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_parsePath(t).reduce(
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(e, t) => (null != e && e.hasOwnProperty(t) ? e[t] : void 0),
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e
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),
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_simpleSet = (e, t, r) =>
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_parsePath(t).reduce((e, t, a, l) => {
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let s = a === l.length - 1;
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return (
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(e.hasOwnProperty(t) && (s || _isPlainObject(e[t]))) || (e[t] = {}),
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s ? (e[t] = r) : e[t]
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);
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}, e);
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