Arrays - Exercise - 10. Ladybugs

function ladybugs(tokens = []) {
    let fieldSize = +tokens[0];
    let ladyBugs = [];

    for (let i = 0; i < fieldSize; i++) { // Initialize field
        ladyBugs[i] = 0;
    }

    let initialIndexes = tokens[1].split(' ').map(index => +index);

    for (let i = 0; i < ladyBugs.length; i++) { // Fill bugs on field
        if (initialIndexes.includes(i)) {
            ladyBugs[i] = 1;
        }
    }

    //------------------------------------------------------------------------------------------
    for (let i = 2; i < tokens.length; i++) {
        let command = tokens[i].split(' ');

        if (command[0].toLowerCase() !== 'end') {
            let index = +command[0];

            if (index < 0 || index >= ladyBugs.length) {   // If index is inside the field
                continue;
            }

            if (ladyBugs[index] === 0) {  // cell is empty (NO Lady Bug)
                continue;
            }

            //------------- Fly like the wind -------------
            let direction = command[1];
            let flyLength = +command[2];

            if (flyLength < 0) { // If flyLength is negative, change direction, and make it positive
                flyLength = Math.abs(flyLength);
                switch (direction) {
                    case 'right':
                        direction = 'left';
                        break;
                    case 'left':
                        direction = 'right';
                        break;
                }
            }

            ladyBugs[index] = 0; // Lift off in 3...2...1
            let isBugFlying = true;

            while (isBugFlying) {
                switch (direction) {
                    case 'right':
                        if (index + flyLength >= ladyBugs.length) { // Lady Bug flew away (outside field)
                            isBugFlying = false;
                        } else {
                            if (ladyBugs[index + flyLength] === 0) { // is cell empty (no Lady Bug at index)
                                ladyBugs[index + flyLength] = 1; // Lady Bug landed
                                isBugFlying = false;
                            } else {
                                isBugFlying = true; // Lady Bug continues to fly
                                index += flyLength;
                            }
                        }
                        break;
                    case 'left':
                        if (index - flyLength < 0) { // Lady Bug flew away (outside field)
                            isBugFlying = false;
                        } else {
                            if (ladyBugs[index - flyLength] === 0) { // is cell empty (no Lady Bug at index)
                                ladyBugs[index - flyLength] = 1; // Lady Bug landed
                                isBugFlying = false;
                            } else {
                                isBugFlying = true; // Lady Bug continues to fly
                                index -= flyLength;
                            }
                        }
                        break;
                }
            }
        }
    }
    console.log(ladyBugs.join(' '));
}