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averageBy javascript Code Snippet in 2022

matharrayintermediate

Last Updated: 25 September 2022

Calculates the average of an array, after mapping each element to a value using the provided function.

  • Use Array.prototype.map() to map each element to the value returned by fn.
  • Use Array.prototype.reduce() to add each value to an accumulator, initialized with a value of 0.
  • Divide the resulting array by its length.
const averageBy = (arr, fn) => arr .map(typeof fn === 'function' ? fn : val => val[fn]) .reduce((acc, val) => acc + val, 0) / arr.length;
averageBy([{ n: 4 }, { n: 2 }, { n: 8 }, { n: 6 }], o => o.n); // 5 averageBy([{ n: 4 }, { n: 2 }, { n: 8 }, { n: 6 }], 'n'); // 5

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