document.getElementById("submit").onclick =
function(){
      let result = '';
      let input= document.getElementById("left").value;
      let check = input.split(',');
      if(check.length !== 2){
        result = " Wrong Input, Input can and must be two digits"
      }
      //return;


      let weigh = document.getElementById("weights-array").value;
      let checkWeight= weigh.split(',');
      if(checkWeight.length < 2){
        result = " Wrong Input, Input  must be greater than two digits"
      }
      let arr = [check, checkWeight];
      return;


    function balanceScale(arr){

        //Firstly, we need to convert our strings to numbers we can use in the Array

        let scaleWeights = arr[0].match(/d+/g).map(Number);

        let weights = arr[1].match(/d+/g).map(Number);

        let leftSide = scaleWeights[0];

        let rightSide = scaleWeights[1];

        // Secondly, we check for adding weight to one side of the scale i.e leftside or rightside
        for(let i = 0; i < weights.length; i++){
            if(leftSide < rightSide){
                if(leftSide + weights[i] === rightSide){
                  result = weights[i];
                    return result;

                }else if(rightSide + weights[i] === leftSide){
                    result = weights[i];
                    return result;

                }
            }
        }

        //Thirdly, we check for adding weights to both sidess of the scale ie. leftside && rightside
        let i,j;
        for(i = 0; i < weights.length; i++){
            for(j =0; j < weights.length[i]; j++){
                if(leftSide + weights[i] === rightSide + weights[j]){
                  result = weights[i] + ' ' + weights[j];
                  return result;
                }else if(rightSide + weights[i] === leftSide + weights[j]){
                  result = weights[i] + ' ' + weights[j];
                  return result;
                }
            }
        }

        //Lastly we check to add (2) two weights to one side of the scale
        if( leftSide + weights[i] + weights[j] === rightSide){
          result = weights[i] + ' ' + weights[j];
          return result;

        }else if (rightSide + weights[i] + weights[j] === leftSide){
          result = weights[i] + ' ' + weights[j];
          return result;

        }
        // if there are no matching weights
        result = "Scale Imbalanced";
        return result;
      }
      document.getElementById("displayresult").innerHTML = result;

    }
     console.log(balanceScale(["[3, 6]", "[1, 2, 7, 7]"]));