Screeps newCreep function - First Attempt

/*
    My idea is for a polymorphic function to create new creeps,
    without an excess of repetitive code. To begin, it will take
    the single parameter which determines the role. In the future
    further parameters might determine body size/type.

*/

// Store the body types here
var harvester_body = '[MOVE, MOVE, MOVE, CARRY, CARRY, CARRY, CARRY, MOVE, MOVE, MOVE]';
var upgrader_body = '[MOVE, CARRY, MOVE, WORK, WORK, MOVE, CARRY, MOVE]';
var builder_body = '[MOVE, MOVE, WORK, CARRY, CARRY, WORK, MOVE, MOVE]';
var repairer_body = '[MOVE, CARRY, MOVE, WORK, WORK, MOVE, CARRY, MOVE]';
var miner_body = '[MOVE, WORK, WORK, WORK, MOVE]';


var newCreep = {
    run: function (creepRole) {
        // My thought here is to generate the name via the role
        var newName = (creepRole + Game.time);
        // And then using the role spawn the creep
        switch (creepRole) {
            case 'harvester':
                Game.spawns.Spawn1.spawnCreep(harvester_body, newName,
                    { memory: { role: creepRole } });
            case 'upgrader':
                Game.spawns.Spawn1.spawnCreep(upgrader_body, newName,
                    { memory: { role: creepRole } });
            case 'builder':
                Game.spawns.Spawn1.spawnCreep(builder_body, newName,
                    { memory: { role: creepRole } });
            case 'repairer':
                Game.spawns.Spawn1.spawnCreep(repairer_body, newName,
                    { memory: { role: creepRole } });
            case 'miner':
                Game.spawns.Spawn1.spawnCreep(miner_body, newName,
                    { memory: { role: creepRole } });
        }
        // I would prefer to be able to call the body type using the role
        // as well, as this would reduce the amount of code required even further.
    }
};

module.exports = newCreep;