findSumInArray.js

const findSumInArray = (arr, sum) => {
  let needle = [];
  let tmpSum = 0;
  
  for(let i = 0; i < arr.length; i++) {
    tmpSum = tmpSum + arr[i];
    needle.push(arr[i]);
    
    if(sum === tmpSum) {
      return needle;
    }
    
    for(let j = i; j < arr.length; j++) {
      if(i === j) {
        continue;
      }
      
      needle.push(arr[j]);
      tmpSum = tmpSum + arr[j];
      
      // console.log({needle, i: arr[i], j: arr[j], tmpSum});
      
      if(sum === tmpSum) {
        return needle;
      }
    }
    
    tmpSum = 0;
    needle = [];
  }
}


const printSum = (arr) => {
  return arr.map((num, i) => {
    if(i === 0 && num > 0) {
      return num;
    }
    
    if(i > 0 && num > 0) {
      return `+ ${num}`;
    } 
    
    if(num < 0) {
      return `- ${num * -1}`;
    }
    
  }).join(" ") + ` = ${arr.reduce((acc, x) => acc + x, 0)}`;
}


// console.log(findSumInArray([1, 4, 20, 3, 10, 5], 33));
// console.log(printSum(findSumInArray([1, 4, 20, 3, 10, 5], 33)));
console.log(printSum(findSumInArray([10, 2, -2, -20, 10], -10)));