disemvowel.js

// https://www.codewars.com/kata/52fba66badcd10859f00097e/train/javascript

const VOWELS = "aeiouAEIOU"

function isNotVowel(letter) {
  //const lowerLetter = letter.toLowerCase()
  return !VOWELS.includes(letter)
//   return lowerLetter !== "a" && lowerLetter !== "e" 
//        && lowerLetter !== "i" && lowerLetter !== "o" 
//        && lowerLetter !== "u"
}

function disemvowel(str) {
  let result = ""
  
  for(let i = 0; i < str.length; i++) {
    const letter = str[i]
    if(isNotVowel(letter)) {
      result += letter // result = result + letter
    }
  }
  
  //let result = str.split("").filter(letter => !VOWELS.includes(letter)).join("")
  
  return result;
}

// for loop = know how many times you're going to loop when the loop starts
// while loop = just know when to stop, but you don't know when that will be

mergeStrings.js

// https://www.codewars.com/kata/61c78b57ee4be50035d28d42/train/javascript

function mergeStrings(first, second){
  const lastOfFirst = first[first.length - 1] // "e"
  let foundIndex = second.length - 1 // start at the last index
  while(foundIndex >= 0) { // we haven't gone off the end
    if(second[foundIndex] === lastOfFirst) { // index2 = 2
      let checkIndex1 = first.length - 2
      let checkIndex2 = foundIndex - 1
      
      let matches = true
      while(checkIndex2 >= 0) {
        if(first[checkIndex1] !== second[checkIndex2]) {
          // There is no overlap
          matches = false
          break;
        }
        checkIndex1--
        checkIndex2--
      }
      // If we found the overlap, return the answer without the overlap in the middle
      if(matches) {
        return first + second.slice(foundIndex + 1)
      }
    }
    foundIndex--
  }
  // if you don't find that letter, then just concatenate
  return first + second
}


// As a human being
"abaabaab"
"aabaabab"
// look at last letter of first string
// starting at the beginning of the second string, find that letter

// start going backwards in each string to see if they match
// if they match, take out that chunk of first string


// if you don't find that letter, then just concatenate


"abaabaabab"