02. Array Modifier

function arrayModifier(input) {
    let numbers = input[0].split(' ').map(Number);

    for (let i = 1; input[i] != "end"; i++) {
        [command, index1, index2] = input[i].split(' ');

        if (command == "decrease") {
            for (let i = 0; i < numbers.length; i++) {
                numbers[i]--;
            }
        } else {
            if (command == "swap") {
                let value = numbers[index1];
                numbers[index1] = numbers[index2];
                numbers[index2] = value;
            } else {
                numbers[index1] *= numbers[index2];
            }
        }
    }

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