06. Cake

РЕШЕНИЯ С WHILE:

function cake(input) {
    let index = 2;
    let width = Number(input[0]);
    let length = Number(input[1]);
    let cakePieces = width * length;
    let command = input[index];

    while (command !== "STOP") {
        cakePieces -= Number(command);
        if (cakePieces <= 0) {
            break;
        }
        index++;
        command = input[index];
    }
    if (cakePieces >= 0) {
        console.log(`${cakePieces} pieces are left.`);
    } else {
        console.log(`No more cake left! You need ${Math.abs(cakePieces)} pieces more.`);
    }
}

Или леко тарикатската:)

function cake(input) {
    let index = 2;
    let cakePieces = Number(input[0]) * Number(input[1]);

    while (input[index] !== "STOP" && cakePieces > 0) {
        cakePieces -= Number(input[index++]);
    }

    if (cakePieces >= 0) {
        console.log(`${cakePieces} pieces are left.`);
    } else {
        console.log(`No more cake left! You need ${Math.abs(cakePieces)} pieces more.`);
    }
}

Решение със shift() и тернарен оператор:

function cake(input) {
    let cakePieces = Number(input.shift()) * Number(input.shift());

    while (input[0] !== "STOP" && cakePieces > 0) {
        cakePieces -= Number(input.shift());
    }

    console.log(cakePieces >= 0 ? `${cakePieces} pieces are left.` :
        `No more cake left! You need ${Math.abs(cakePieces)} pieces more.`);
}

РЕШЕНИЯ С FOR:

function cake(input) {
    let width = Number(input[0]);
    let length = Number(input[1]);
    let cakePieces = width * length;

    for (let i = 2; i < input.length; i++) {
        let command = input[i];
        if (command === "STOP") {
            break;
        }
        cakePieces -= Number(command);
        if (cakePieces <= 0) {
            break;
        }
    }

    if (cakePieces >= 0) {
        console.log(`${cakePieces} pieces are left.`);
    } else {
        console.log(`No more cake left! You need ${Math.abs(cakePieces)} pieces more.`);
    }
}

Или леко тарикатската и с тернарен оператор:)

function cake(input) {
    let cakePieces = Number(input[0]) * Number(input[1]);

    for (let i = 2; i < input.length; i++) {
        if (input[i] === "STOP" || cakePieces < 0) {
            break;
        }
        cakePieces -= Number(input[i]);
    }

    console.log(cakePieces >= 0 ? `${cakePieces} pieces are left.` :
        `No more cake left! You need ${Math.abs(cakePieces)} pieces more.`);
}

РЕШЕНИЕ С МЕТОДИ И ТЕРНАРЕН ОПЕРАТОР:

function cake(input) {
    let cakePieces = Number(input.shift()) * Number(input.shift()) -
        input.slice(0, input.includes("STOP") ? -1 : input.length).map(Number).reduce((a, b) => a + b);

    console.log(cakePieces >= 0 ? `${cakePieces} pieces are left.` :
        `No more cake left! You need ${Math.abs(cakePieces)} pieces more.`);
}