8 lines
219 B
JavaScript
8 lines
219 B
JavaScript
const invertKeyValues = (obj, fn) =>
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Object.keys(obj).reduce((acc, key) => {
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const val = fn ? fn(obj[key]) : obj[key];
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acc[val] = acc[val] || [];
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acc[val].push(key);
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return acc;
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}, {});
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module.exports = invertKeyValues; |