heartDelivery.js

function heartDelivery(input) {
    let index = 0;
    let command = input[index];
    index++;
    let neighbourhood = command.split(`@`).map(Number);
    let houseIndex = 0;
    let houseCount = 0;

    while (command !== "Love!") {
        let jump = input[index].split(" ");
        let jumpLength = Number(jump[1]);
        houseIndex += jumpLength;
        if (houseIndex >= neighbourhood.length) {
            houseIndex = 0;
        }

        if (neighbourhood[houseIndex] === 0) {
            console.log(`Place ${houseIndex} already had Valentine's day.`);
        } else if (neighbourhood[houseIndex] - 2 === 0) {
            neighbourhood[houseIndex] -= 2;
            houseCount++;
            console.log(`Place ${houseIndex} has Valentine's day.`);
        } else {
            neighbourhood[houseIndex] -= 2;
        }

        index++;
        command = input[index];
    }

    console.log(`Cupid's last position was ${houseIndex}.`);
    neighbourhood.length - houseCount === 0 ? console.log("Mission was successful.") :
    console.log(`Cupid has failed ${neighbourhood.length - houseCount} places.`);
}

heartDelivery(["10@10@10@2",
"Jump 1",
"Jump 2",
"Love!"]);
heartDelivery(["2@4@2",
"Jump 2",
"Jump 2",
"Jump 8",
"Jump 3",
"Jump 1",
"Love!"]);
heartDelivery(["2@2@2",
"Jump 1",
"Jump 1",
"Jump 1",
"Love!"]);