Pair whose sum exists in the array in JavaScript

We are required to write a JavaScript function that takes in an array of Numbers. The function should pick a pair of two numbers which are at different indices (consecutive or nonconsecutive) whose sum also exists in the array.

Example

Following is the code −

const arr = [1, 3, 5, 6, 8, 9];
const findPair = (arr = []) => {
   let count = 0;
   for(let i = 0; i < arr.length; i++){
      for(let j = 0; j < arr.length; j++){
         if(i === j){
            break;
         };
         let sum = arr[i] + arr[j];
         if(arr.includes(sum)){
            return [arr[i], arr[j]];
         };
      };
   };
   return [];
};
console.log(findPair(arr));

Output

Following is the output on console −

[5, 1]