pig_latin.ts

/*
As a user I can enter a phrase "hello" and see it translated to Pig Latin "ellohay"
As a user I can enter a phrase "hello world" and see it translated to Pig Latin "ellohay orldway"
As a user I can enter a phrase "Hello World" and see it translated to Pig Latin "Ellohay Orldway"
As a user I can enter a phrase "Hello, world!" and see it translated to Pig Latin "Ellohay, orldway!"
As a user I can enter a phrase "eat apples" and see it translated to Pig Latin "eatay applesay"
As a user I can enter a phrase "quick brown fox" and see it translated to Pig Latin "ickquay ownbray oxfay" 
*/


function transformSentence(sentence) {
    const wordList = sentence.split(" ")
    const transformedWordList = []
    for (const word of wordList) {
        const transformed = transformWord(word)
        transformedWordList.push(transformed)
    }
    return transformedWordList.join(" ")
}

function transformWord(word:String) {
    let result = word
    let punctuation = ""

    if (endsWithPunctation(word)){
        punctuation = word.slice(-1)
        result = word.slice(0, -1)
    }

    if (!startsWithVowel(word)){
        result = startsWithConsonantCluster(word)? 
            result.slice(2) + result.slice(0, 2):
            result.slice(1) + result[0]
    }
    
    if (doesStartUpperCase(word)){
        result = result[0].toUpperCase() + result.slice(1).toLowerCase()
    }

    result = result + "ay" + punctuation
    return result
}

function doesStartUpperCase(word) { 
    return word[0] === word[0].toUpperCase()
}

function endsWithPunctation(word) {
    const lastChar = word.slice(-1)
    return lastChar.match(/[a-z]/i) === null;
}

function startsWithVowel(word) {
    return isVowel(word[0])
}

function isVowel(letter) { 
    const vowels = ['a', 'e', 'i', 'o', 'u']
    return vowels.includes(letter.toLowerCase())
}

function startsWithConsonantCluster(word) {
    const consonantClusters = ['qu', 'br']
    return consonantClusters.includes(word.slice(0, 2))
}


console.log(transformSentence("hello"))
console.log(transformSentence("hello world"))
console.log(transformSentence("Hello World"))
console.log(transformSentence("Hello, World!"))
console.log(transformSentence("eat apples"))
console.log(transformSentence("quick brown fox"))