01.Farm Management System

function solve (commandArr) {
    class Farmer {
        constructor (name, location) {
            this.name = name;
            this.location = location;
            this.skills = []
        }
    }

    let farmerArr = [];
    let numFarmers = Number(commandArr[0]);

    for (let idx = 1; idx <= numFarmers; idx++) {
        let farmerStr = commandArr[idx];
        let [name, location, skills] = farmerStr.split(' ');
        let farmer = new Farmer(name, location);
        let skillArr = skills.split(',');

        for (let skill of skillArr) {
            farmer.skills.push(skill);
        }
        farmerArr.push(farmer);
    }

    for (let idx = numFarmers + 1; idx < commandArr.length; idx++) {
        currentCommandTokens = commandArr[idx].split(' / ');
        if (currentCommandTokens[0] === "End") {
            break;
        } else if (currentCommandTokens[0] === "Execute") {
            let [_, name, location, task] = currentCommandTokens;
            let currentFarmer = farmerArr.find(p => p.name === name);

            if (!currentFarmer) {
                continue;
            }

            if (currentFarmer.location !== location) {
                console.log(`${currentFarmer.name} cannot execute the task: ${task}.`);
                continue;
            }

            if (!currentFarmer.skills.includes(task)) {
                console.log(`${currentFarmer.name} cannot execute the task: ${task}.`);
                continue;
            }

            console.log(`${currentFarmer.name} has executed the task: ${task}!`)

        } else if (currentCommandTokens[0] === "Change Area") {
            let [_, name, location] = currentCommandTokens;
            let currentFarmer = farmerArr.find(p => p.name === name);

            if (!currentFarmer) {
                continue;
            }

            if (currentFarmer.location !== location) {
                currentFarmer.location = location;
                console.log(`${currentFarmer.name} has changed their work area to: ${location}`);
            }

        } else if (currentCommandTokens[0] === "Learn Task") {
            let [_, name, task] = currentCommandTokens;
            let currentFarmer = farmerArr.find(p => p.name === name);

            if (!currentFarmer) {
                continue;
            }

            if (currentFarmer.skills.includes(task)) {
                console.log(`${currentFarmer.name} already knows how to perform ${task}.`);
            } else {
                currentFarmer.skills.push(task);
                console.log(`${currentFarmer.name} has learned a new task: ${task}.`);
            }
        }
    }

    for (let farmer of farmerArr) {
        console.log(`Farmer: ${farmer.name}, Area: ${farmer.location}, Tasks: ${farmer.skills.sort().join(', ')}`);
    }

}