Farm

function solve (input) {

    const countFarmers = input.shift();
    let farmers = [];

    for (let i = 0; i < countFarmers; i++) {
        let currentFarmer = input.shift().split(' ');
        const farmerName = currentFarmer.shift();
        const workArea = currentFarmer.shift();
        let tasks = currentFarmer.shift().split(',');

        let farmer = {
            name: farmerName,
            workArea: workArea,
            tasks: tasks
        };

        farmers.push(farmer);
    }

    let tokens = input.shift().split(' / ');

    while(tokens[0] !== "End") {

        switch (tokens[0]) {

            case 'Execute': {
                const farmerName = tokens[1];
                const workArea = tokens[2];
                const task = tokens[3];

                let farmer = farmers.find(f => f.name === farmerName);

                if (farmer.workArea === workArea && farmer.tasks.includes(task)) {
                    console.log(`${farmerName} has executed the task: ${task}!`);
                } else {
                    console.log(`${farmerName} cannot execute the task: ${task}.`);
                }
                break;
            }

            case `Change Area`: {
                const farmerName = tokens[1];
                const newWorkArea = tokens[2];

                farmers.find(f => f.name === farmerName).workArea = newWorkArea;

                console.log(`${farmerName} has changed their work area to: ${newWorkArea}`)
                break;
            }

            case `Learn Task`: {
                const farmerName = tokens[1];
                const newTask = tokens[2];

                if (farmers.find(f => f.name === farmerName).tasks.includes(newTask)) {
                    console.log(`${farmerName} already knows how to perform ${newTask}.`);
                } else {
                    farmers.find(f => f.name === farmerName).tasks.push(newTask);
                    console.log(`${farmerName} has learned a new task: ${newTask}.`);
                }
                break;
            }
        }


        tokens = input.shift().split(' / ');
    }

    for (let farmer of farmers) {
       farmer.tasks.sort((a, b) => a.localeCompare(b));
       console.log(`Farmer: ${farmer.name}, Area: ${farmer.workArea}, Tasks: ${farmer.tasks.join(', ')}`);
    }

}

solve([
    "2",
    "John garden watering,weeding",
    "Mary barn feeding,cleaning",
    "Execute / John / garden / watering",
    "Execute / Mary / garden / feeding",
    "Learn Task / John / planting",
    "Execute / John / garden / planting",
    "Change Area / Mary / garden",
    "Execute / Mary / garden / cleaning",
    "End"
  ] )