JAVASCRIPT

JS two numbers in array whose sum equals a given number

let twoSum = (array, sum) => {
    let hashMap = {},
      results = []

        for (let i = 0; i < array.length; i++){
            if (hashMap[array[i]]){
                results.push([hashMap[array[i]], array[i]])
            }else{
                hashMap[sum - array[i]] = array[i];
            }
          }
          return results;
    }
console.log(twoSum([10,20,10,40,50,60,70,30],50));

find if two elements in array sum to given integer js

function twoSum(arr, S) {
 const sum = [];
  for(let i = 0; i< arr.length; i++) {
    for(let j = i+1;  j < arr.length; j++) {
      if(S == arr[i] + arr[j]) sum.push([arr[i],arr[j]])
    }
  }
 return sum
}