Closest numeric match

JavaScript, Math · Mar 30, 2022

Finds the closest number from an array.

Use Array.prototype.reduce() to scan all elements of the array.
Use Math.abs() to compare each element's distance from the target value, storing the closest match.

const closest = (arr, n) =>
  arr.reduce((acc, num) => (Math.abs(num - n) < Math.abs(acc - n) ? num : acc));

closest([6, 1, 3, 7, 9], 5); // 6

Written by Angelos Chalaris

I'm Angelos Chalaris, a JavaScript software engineer, based in Athens, Greece. The best snippets from my coding adventures are published here to help others learn to code.

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