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Find closest index of array in JavaScript
Suppose, we have an array like this −
const arr = [2, 42, 82, 122, 162, 202, 242, 282, 322, 362];
We are required to write a JavaScript function that takes in one such array and a number, say n.
The function should return the index of item from the array which is closest to the number n.
Example
Following is the code −
const arr = [2, 42, 82, 122, 162, 202, 242, 282, 322, 362]; const closestIndex = (num, arr) => { let curr = arr[0], diff = Math.abs(num - curr); let index = 0; for (let val = 0; val < arr.length; val++) { let newdiff = Math.abs(num - arr[val]); if (newdiff < diff) { diff = newdiff; curr = arr[val]; index = val; }; }; return index; }; console.log(closestIndex(150, arr));
Output
This will produce the following output on console −
4
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