9 lines
815 B
JavaScript
9 lines
815 B
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)=>{let r=e.map(e=>t.map(t=>t(e))),a={};return r.forEach((t,r)=>{let l=(_simpleAt(a,t)||[]).concat([e[r]]);_simpleSet(a,t,l)}),a},_isPlainObject=e=>null!=e&&"object"==typeof e&&e.constructor==Object,_parsePath=e=>Array.isArray(e)?e:`${e}`.split("."),_simpleAt=(e,t)=>_parsePath(t).reduce((e,t)=>null!=e&&e.hasOwnProperty(t)?e[t]:void 0,e),_simpleSet=(e,t,r)=>_parsePath(t).reduce((e,t,a,l)=>{let s=a===l.length-1;return e.hasOwnProperty(t)&&(s||_isPlainObject(e[t]))||(e[t]={}),s?e[t]=r:e[t]},e); |