Get the closest number out of an array in JavaScript

We are required to write a JavaScript function that takes in an array of Numbers as the first argument and a single number as the second argument.

The function should find and return that number from the array which is closest to the number specified by the second argument.

For example −

const arr = [34, 67, 31, 53, 89, 12, 4];
const num = 41;

Then the output should be 34.

Example

Following is the code −

const arr = [34, 67, 31, 53, 89, 12, 4];
const num = 41;
const findClosest = (arr = [], num) => {
   let curr = arr[0];
   let diff = Math.abs (num - curr);
   for (let val = 0; val < arr.length; val++) {
      let newdiff = Math.abs (num - arr[val]);
      if (newdiff < diff) {
         diff = newdiff;
         curr = arr[val];
      };
   };
   return curr;
};
console.log(findClosest(arr, num));

Output

Following is the output on console −

34

AmitDiwan

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Updated on: 10-Dec-2020

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