piglatinify.js

/*
Rules:
1. Any word that starts with a vowel, add "way" to the end of the word
2. Any word that starts with a consonant, move the first letter of the word to the end of the word, and then add "ay" after that
*/
const vowels = ['a', 'e', 'i', 'o', 'u'];
const allLetters = ['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'];



module.exports = function pigLatinize (str) {

	function latinify(str) {

		const precedingPunctation = getPrecedingPunctation(str);
		const trailingPunctation = getTrailingPunctuation(str);

		const puncLess = str.split('').filter(letter => allLetters.includes(letter.toLowerCase())).join('');
		const firstLetterWasCapitolized = puncLess[0] === puncLess[0].toUpperCase();

		const isVowelStart = vowels.includes(puncLess[0].toLowerCase());

		const latinifiedWord = isVowelStart
			? puncLess + 'way'
			: puncLess.slice(1) + puncLess[0] + 'ay';

		const capitolized = firstLetterWasCapitolized
			? latinifiedWord[0].toUpperCase() + latinifiedWord.slice(1, latinifiedWord.length).toLowerCase()
			: latinifiedWord;

		return precedingPunctation + stripPunctuation(capitolized) + trailingPunctation;

	}


	function latinifySegment(sentence) {
		return sentence.split(' ').map(latinify).join(' ');
	}

	const dashedSegments = str.split('-');
	return dashedSegments.map(latinifySegment).join('-');

};

/**
*
* Helpers
*
*/


function getPrecedingPunctation(str) {
	const innerFindPunctuations = (str, puncsFound) => {
		const letters = str.split('');
		for (let i = 0; i < letters.length; i++) {
			const letter = letters[i];
			if (allLetters.includes(letter.toLowerCase())) {
				return puncsFound;
			}
			else {
				return innerFindPunctuations(str.slice(1), puncsFound + letter);
			}
		}
	};
	return innerFindPunctuations(str, '');
}

function getTrailingPunctuation(str) {
	const flipped = str.split('').reverse().join('');
	const punctuation = getPrecedingPunctation(flipped);
	return punctuation.split('').reverse().join('');
}

function stripPunctuation(str) {
	return str.split('')
		.filter(letter => allLetters.includes(letter.toLowerCase()))
		.join('');
}