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maxBy javascript Code Snippet in 2024

matharraybeginner

Last Updated: 19 May 2024

Returns the maximum value 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 Math.max() to get the maximum value.
const maxBy = (arr, fn) => Math.max(...arr.map(typeof fn === 'function' ? fn : val => val[fn]));
maxBy([{ n: 4 }, { n: 2 }, { n: 8 }, { n: 6 }], x => x.n); // 8 maxBy([{ n: 4 }, { n: 2 }, { n: 8 }, { n: 6 }], 'n'); // 8

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