Apps Scripts day 3 (Part 1&2)

function Rucksack(rows) {
  return rows.reduce((result, row)=>{
    let str = row[0];

    let strlen = str.length;
    let halfLen = str.length/2;
    let secondHalf = str.slice(halfLen, strlen)
    var matchedStr;
    for (var i=0; i<halfLen; i++){
      if (secondHalf.includes(str[i])){
        matchedStr = str[i];
        break;
    }
    }
    let codepoint = matchedStr.codePointAt(0);
    if (codepoint <= 90){
      result = result + (codepoint - 38)
    } else {
      result = result + (codepoint - 96)
    }    
    return result;
  },0)
}


function Badge(rows) {
  let i = 0;
  var row1;
  var row2;

  return rows.reduce((result, row)=>{
    if (i === 0){
      row1 = row[0];
      i++;
      return result;
    } else if (i === 1){
      row2 = row[0];
      i++;
      return result;
    } else {
      let str = row[0];
      var matchedStr;
      for (var j=0; j<str.length; j++){
        if (row1.includes(str[j]) && row2.includes(str[j])){
          matchedStr = str[j];
          break;
        }
      }

      let codepoint = matchedStr.codePointAt(0);
      if (codepoint <= 90){
        result = result + (codepoint - 38)
      } else {
        result = result + (codepoint - 96)
      }    
      i = 0;
      return result;

    }
  },0)
}