Javascript:Find pair of number in array whose sum matches target number

 

Find pair of number in array whose sum matches target number

code:

let target =9

let  arr = [2,7,11,15];

for (let i = 0; i < arr.length; i++) {

    for (let j = i + 1; j < arr.length; j++) {

        if (arr[i] + arr[j] === target) {

            console.log(`i=${i}, j=${j}`);

        }

    }

}  

Output:

i=0, j=1

Explanation:

try to sum up each pair and checked if sum matches target