function test(array) {
    let numbers = array.shift().split(" ").map(Number);

    for (let i = 0; i < array.length; i++) {
        let [command, firstNum, secondNum] = array[i].split(" ");

        firstNum = Number(firstNum);
        secondNum = Number(secondNum);

        switch (command) {
            case "swap":
                swapElememts(firstNum, secondNum);
                break;
            case "multiply":
                multiplyElements(firstNum, secondNum);
                break;
            case "decrease":
                decreaseElements();     //nested function, passing parent function variable not needed
                break;
            case "end":
                break;
        }
    }

    function swapElememts(elOne, elTwo) {
        let temp = numbers[elOne];
        numbers[elOne] = numbers[elTwo];
        numbers[elTwo] = temp;
    }

    function multiplyElements(elOne, elTwo) {
        numbers[elOne] = numbers[elOne] * numbers[elTwo];
    }

    function decreaseElements() {
        numbers = numbers.map((element) =>      //map to change all elements based on function
            element - 1
        );
    }

    console.log(numbers.join(", "));
}