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groupBy javascript Code Snippet in 2023

arrayobjectintermediate

Last Updated: 3 February 2023

Groups the elements of an array based on the given function.

  • Use Array.prototype.map() to map the values of the array to a function or property name.
  • Use Array.prototype.reduce() to create an object, where the keys are produced from the mapped results.
const groupBy = (arr, fn) => arr .map(typeof fn === 'function' ? fn : val => val[fn]) .reduce((acc, val, i) => { acc[val] = (acc[val] || []).concat(arr[i]); return acc; }, {});
groupBy([6.1, 4.2, 6.3], Math.floor); // {4: [4.2], 6: [6.1, 6.3]} groupBy(['one', 'two', 'three'], 'length'); // {3: ['one', 'two'], 5: ['three']}

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