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#1

I am having trouble figuring out how to use an if statement that checks if a letter in a string is equal to e or u and then replacing it with ee or uu. The code I have works, but doesn’t seem like the simplest way to do it.
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Here is my code:


const vowels = ['a', 'e', 'i', 'o', 'u'];

let resultArray = [];

for (let i = 0; i < input.length; i++) {
  for (let v = 0; v < vowels.length; v++) {
    if (input[i] === vowels[v]) {
      if (input[i] === 'u' || input[i] === 'e') {
        resultArray.push(input[i], input[i]); //non-repetitive way
        } else {                             //to do this?
        resultArray.push(input[i]);
      }
    } 
  }
};
console.log(resultArray.join('').toUpperCase()); //output: UUEEIEEAUUEE
#2

You can split it into smaller parts and use map and filter

One useful component would be isVowel, another would be one that doubles only e/u while letting others through without modification

> isVowel = (`elem` "aoeui")
> doubleEU = (\c -> if c `elem` "eu" then [c,c] else [c])
> "blahblehbluh" & map doubleEU >>= filter isVowel
"aeeuu"

Each individual part is simpler because it’s doing fewer things. Combining them still gives the same outcome.

A less drastic change is to do one thing and then the other, instead of doing them both at the same time. You could filter out non-vowels. Then, modify the e’s and u’s.

// not nested:

for whatever {
  eliminate non-vowels
}

for something {
  alter e's and u's
}
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#3

You could add an additional variable which has the conversion vowels pre-made so instead of pushing the input[i] value you could instead push the conv[v] value. Something like this:

let input = 'turpentine and turtles'
const vowels = ['a', 'e', 'i', 'o', 'u'];
const conv = ['A', 'EE', 'I', 'O', 'UU']
let resultString = '';

for (let i = 0; i < input.length; i++) {
  for (let v = 0; v < vowels.length; v++) {
    if (input[i] === vowels[v]) {
        resultString += conv[v] //non-repetitive way
    }
  } 
}

console.log(resultString); //output: UUEEIEEAUUEE
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#4

A translation table. That is neat.

const trans = {'a': 'a', 'o': 'o', 'e': 'ee', 'u': 'uu', 'i': 'i'}
const transChar = (ch) => (trans[ch] || '').toUpperCase()
const transStr = (str) => ''.concat(...str.split('').map(transChar))
const input = 'turpentine and turtles'
console.log(transStr(input))

(leave it to me to needlessly use things out of scope)

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