Number of Smaller and Larger Elements in JavaScript

Suppose, we have an array of literals like this −

const arr = [3, 5, 5, 2, 23, 4, 7, 8, 8, 9];

We are required to write a JavaScript function that takes in this array and a number, say n, and returns an object representing the count of elements greater than and smaller than n.

Example

Following is the code −

const arr = [3, 5, 5, 2, 23, 4, 7, 8, 8, 9];
const greaterSmallerNumbers = (arr, num) => {
   return arr.reduce((acc, val) => {
      let { greater, smaller } = acc;
      if(val > num){
         greater++;
      };
      if(val < num){
         smaller++;
   };
   return { greater, smaller };
   }, {
      greater: 0,
      smaller: 0
   });
};
console.log(greaterSmallerNumbers(arr, 3));

Output

Following is the output in the console −

{ greater: 8, smaller: 1 }