deckOfCards.js

function deckOfCards(input) {
    let index = 0;
    let cardList = input[index].split(`, `);
    index++;
    let cmdCounter = Number(input[index]);
    index++;

    for (let i = 0; i < cmdCounter; i++) {
        let cmdList = input[index].split(`, `);
        index++;
        let cmd = cmdList[0];
        let value = cmdList[1];

        if (cmd === "Add" && !cardList.includes(value)) {
            cardList.push(value);
            console.log("Card successfully added");
        } else if (cmd === "Add") {
            console.log("Card is already in the deck");
        }

        if (cmd === "Remove" && cardList.includes(value)) {
            let cardIndex = cardList.indexOf(value);
            cardList.splice(cardIndex, 1);
            console.log("Card successfully removed");
        } else if (cmd === "Remove") {
            console.log("Card not found");
        }

        if (cmd === "Remove At" && cardList[Number(value)] !== undefined) {
            let cardIndex = Number(value);
            cardList.splice(cardIndex, 1);
            console.log("Card successfully removed");
        } else if (cmd === "Remove At") {
            console.log("Index out of range");
        }

        if (cmd === "Insert" && cardList[Number(value)] !== undefined && cardList[Number(value)] === cmdList[2]) {
            console.log("Card is already in the deck");
        } else if (cmd === "Insert" && cardList[Number(value)] !== undefined) {
            let cardIndex = Number(value);
            cardList.splice(cardIndex, 0, cmdList[2]);
            console.log("Card successfully added");
        } else if (cmd === "Insert") {
            console.log("Index out of range");
        }
    }
    console.log(cardList.join(`, `));
}