Sorting Array with JavaScript Reduce Function

We are required to write a JavaScript function that takes in an array of numbers. The function should sort the array with using the Array.prototype.sort() method. We are required to use the Array.prototype.reduce() method to sort the array.

Let’s say the following is our array −

const arr = [4, 56, 5, 3, 34, 37, 89, 57, 98];

Example

Following is the code −

// we will sort this array but
// without using the array sort function
// without using any kind of conventional loops
// using the ES6 function reduce()
const arr = [4, 56, 5, 3, 34, 37, 89, 57, 98];
const sortWithReduce = arr => {
   return arr.reduce((acc, val) => {
      let ind = 0;
      while(ind < arr.length && val < arr[ind]){
         ind++;
      }
      acc.splice(ind, 0, val);
      return acc;
   }, []);
};
console.log(sortWithReduce(arr));

Output

This will produce the following output in console −

[
 98, 57, 89, 37, 34,
  5, 56,  4,  3
]