9 lines
229 B
JavaScript
9 lines
229 B
JavaScript
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export function groupBy(array, key) {
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return array.reduce((hash, obj) => {
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if (obj[key] === undefined) return hash;
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return Object.assign(hash, {
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[obj[key]]: (hash[obj[key]] || []).concat(obj),
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});
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}, {});
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}
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