halfling

robot.js

var IDLE = 0;
var SCANNED = 1;

//FightCode can only understand your robot
//if its class is called Robot
var Robot = function(robot) {
    this.state = IDLE;
};


Robot.prototype.scannedState() {
    robot.ahead(100);
    robot.rotateCannon(-15);
    robot.back(100);
    robot.rotateCannon(15);
    this.state = IDLE;
}

Robot.prototype.idleState() {
    robot.ahead(30);
    robot.rotateCannon(90);
    robot.back(30);
    robot.rotateCannon(90);
    robot.back(30);
    robot.rotateCannon(90);
    robot.back(30);
    robot.rotateCannon(90);
}

Robot.prototype.onIdle = function(ev) {
    var robot = ev.robot;
    if (this.state == IDLE)
        this.idleState();
    else if (this.state == SCANNED)
        this.scannedState
};

Robot.prototype.onScannedRobot = function(ev) {
    var robot = ev.robot;
    // this.state = SCANNED;
    robot.fire();
};

What about triple equality? Be careful man! JavaScript! 👍