Tasks Planner

function solve(arr) {


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

    for (const input of arr) {

        task = input.split(' ');
        let command = task.shift();

        if (command === 'Complete') {

            let currentIndex = Number(task[0]);
            if (currentIndex >= 0 && currentIndex < tasks.length - 1) {
                tasks[currentIndex] = 0;
                continue;
            }

        }
        if (command === 'Change') {

            let currentIndex = Number(task[0]);
            let newTime = Number(task[1]);
            if (currentIndex >= 0 && currentIndex < tasks.length - 1) {
                tasks[currentIndex] = newTime;
                continue;
            }
        }
        if (command === 'Drop') {

            let currentIndex = Number(task[0]);
            if (currentIndex >= 0 && currentIndex < tasks.length - 1) {
                tasks[currentIndex] = -1;
                continue;
            }

        }
        if (command === 'Count') {
            let typeOfCommand = task[0];
            if (typeOfCommand === 'Completed') {
                let countCompleted = 0;
                for (const el of tasks) {
                    if (el === 0) {
                        countCompleted++;
                    }
                }
                console.log(countCompleted);
            } else if (typeOfCommand === 'Incomplete') {
                let countIncomplete = 0;
                for (const el of tasks) {
                    if (el != 0 && el != -1) {
                        countIncomplete++;
                    }
                }
                console.log(countIncomplete);
            } else if (typeOfCommand === 'Dropped') {
                let countDropped = 0;
                for (const el of tasks) {
                    if (el === -1) {
                        countDropped++;
                    }
                }
                console.log(countDropped);
            }

        }

    }

    let remainingTasks = tasks.filter(a => a > 0);

    console.log(remainingTasks.join(' '));


}


solve([
    '1 -1 2 3 4 5',
    'Complete 4',
    'Change 0 4',
    'Drop 3',
    'Count Dropped',
    'End'
]);