The Most Powerful Word

function word(input) {
    let word = input.shift();

    let thePowerfulWord = "";
    let powerOfTheWord = 0;

    while (word !== "End of words") {
        let digitsSum = 0;
        let index = 1;
        let mustRound = false;

        for (let i = 0; i < word.length; i++) {
            let currentDigit = Number(word.charCodeAt(i))
            digitsSum += currentDigit;

            let firstDigit = word[0];
            if (firstDigit === 'a' || firstDigit === 'e' || firstDigit === 'i' ||
                firstDigit === 'o' || firstDigit === 'u' || firstDigit === 'y' ||
                firstDigit === 'A' || firstDigit === 'E' || firstDigit === 'I' ||
                firstDigit === 'O' || firstDigit === 'U' || firstDigit === 'Y') {
                index = word.length;
            }
            else {
                index = 1 / word.length;
                mustRound = true;
            }
        }
        let power = digitsSum * index;
        if (power > powerOfTheWord) {
            thePowerfulWord = word;
            if (mustRound) {
                powerOfTheWord = Math.floor(power);
            }
            else {
                powerOfTheWord = Math.floor(power);
            }
        }
        word = input.shift();
    }
    console.log(`The most powerful word is ${thePowerfulWord} - ${powerOfTheWord}`);
}