Two sums in javascript leetcode problem

let num=[2,3,4,5]

target=9;

const twoSum = function(num, target) {

    for(let i=0;i<num.length;i++){

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

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

                return [i,j]

               }

        } 

    }

};

console.log(twoSum(num,target))