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invertKeyValues javascript Code Snippet in 2024

objectadvanced

Last Updated: 21 May 2024

Inverts the key-value pairs of an object, without mutating it.

  • Use Object.keys() and Array.prototype.reduce() to invert the key-value pairs of an object and apply the function provided (if any).
  • Omit the second argument, fn, to get the inverted keys without applying a function to them.
  • The corresponding inverted value of each inverted key is an array of keys responsible for generating the inverted value. If a function is supplied, it is applied to each inverted key.
const invertKeyValues = (obj, fn) => Object.keys(obj).reduce((acc, key) => { const val = fn ? fn(obj[key]) : obj[key]; acc[val] = acc[val] || []; acc[val].push(key); return acc; }, {});
invertKeyValues({ a: 1, b: 2, c: 1 }); // { 1: [ 'a', 'c' ], 2: [ 'b' ] } invertKeyValues({ a: 1, b: 2, c: 1 }, value => 'group' + value); // { group1: [ 'a', 'c' ], group2: [ 'b' ] }

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