robots.js

$(document).ready(function(){

    var alphabet = _.range(65, 65 + 26).map(function(i){
                    return String.fromCharCode(i)
                    });
    var numbers = _.range(100, 1000);

    var robotFactory = function(){
        var robot = {
            instructionCount: 0,
            assignName: function(){
                this.instructionCount++;
                if(this.name){
                    return this;
                }
                var letterCode = _.sample(alphabet, 2).join('');
                var numCode = _.sample(numbers);
                this.name = letterCode + numCode;
                return this;
            },
            reset: function(){
                this.instructionCount++;
                this.name = ""
                return this;
            }
        }
        return robot;
    }

    var robot = robotFactory()

});