08. Array Manipulator - Lab arrows

function arrayManipulation(commands) {

    let arr = commands.shift().split(' ').map(Number);

    for (let i = 0; i < commands.length; i++) {

        let [command, firstNum, secondNum] = commands[i].split(' ');

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

        switch (command) {
            case 'Add':
                const add = param => arr.push(param);
                add(firstNum);
                break;

            case "Remove":
                const remove = param => arr = arr.filter(el => el !== param);
                remove(firstNum);
                break;

            case "RemoveAt":
                const removeAt = param => arr.splice(param, 1);
                removeAt(firstNum);
                break;

            case "Insert":
                const insert = (param1, param2) => arr.splice(param1, 0, param2);
                insert(secondNum, firstNum);
                break;
        }
    }
    console.log(arr.join(" "));
}