SOURCE

let nums =[2,7,7,11,15]
let nums1=[]
let target=9
let z=[]
var mp = new Map();
for(let i = 0; i < nums.length; i++){
let x=target-nums[i]
if(nums.includes(x)){
    console.log(x,i)
    // break
}
z.push(x)
}