stringToNumber-solutions

/* Write a function addThreeNumsFromString that takes a single string
 * as argument. The given string will consist of three numbers
 * separated by a space. The function will add the three the numbers
 * and return their sum.
 */

/* This is the high-level view of what's going wrong with this
 * program.
 */

console.log(addThreeNumsFromString("5 5 5"))
// will log 15
console.log(addThreeNumsFromString("4 2 1"))
// will log 7


//Your Answer:
var sum = 0;

function addThreeNumsFromStringWrong(str) {
  var newArr = str.split("");
  for (var i = 0; i < str.length; i++) {
    sum += newArr[i];
  }
  return sum;
}
// Your approach, just debugged.
function addThreeNumsFromStringOne (str){
  let sum = 0;
  // Split at the spaces to remove them.
  let newArr = str.split(" ");
  for (let i = 0; i < newArr.length; i++) {
    sum += Number(newArr[i]);
  }
  return sum;
}

/* Also similar to your approach, but using the forEach function means
 * you have less of a chance to mess up.
 */
function addThreeNumsFromStringTwo(str) {
  let sum = 0;
  let newArr = str.split(" ");
  newArr.forEach((number) => {
    sum += Number(number);
  })
  return sum;
}

/* Since the first approach was so close to just being functional,
 * let's take this all the way: a full functional approach.
 */
function addThreeNumsFromStringThree {
  return str.split(" ").map(Number).reduce((sum, value) => sum + value);
}