1. two sum

first solution

const arr = [2,11, 7, 15];
const target = 9;

var twoSum = function(nums, target) {
    let sortArr = nums.sort((a, b) => a - b);
  console.log(sortArr)
  
  for (let i = 0; i < sortArr.length; i++) {
    for (let j = i + 1; j < sortArr.length; j++) {

        if (nums[i] + nums[j] === target) {
        return ([i, j])
        }
    }
  }
};

twoSum(arr, target);