odin-default-js-exercises/05_sumAll/sumAll.js

const sumAll = function(x, y) {
    let theSum;
  
        if (x < 0 || y < 0) {return('ERROR')}
         
        else  
        {

        for (let i = x+1; i <=y; i++) {
        theSum = x += i 


    
      
      }
        return theSum
    }
  
};



// Do not edit below this line
module.exports = sumAll;