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