Object Prototyping not working in Canvas Game

Question

So I'm writing a silly little canvas game, mainly a copy of Asteroids. Anyway, I have my button listener set up so that when the user presses the spacebar, the player object's fire() function is called:

eGi.prototype.keyDownListener = function(event) {
    switch(event.keyCode) {
        case 32:
            player.fire();
            break;

In the fire function, my script checks if the process is already running, and if not, then it creates a new "bullet" object, stores it in a temporary variable, and adds it to a draw stack.

fire:(function() {
    if (this.notFiring) {
        var blankObject = new bullet(this.x,this.y,this.rot,"bullet");
        objects.push(blankObject);
        timer2 = setTimeout((function() {
            objects.pop();
        }),1000);
        this.notFiring = false;
    }}),

(By the way, when the user releases the spacebar, this.notFiring is set back to true.)

This is the bullet object constructor and its required and prototyped method, draw(context):

var bullet = function(x,y,rot,name) {
    this.x = x;
    this.y = y;
    this.sx = 0;
    this.sy = 0;
    this.speed = 1;
    this.maxSpeed = 10;
    this.rot = rot;
    this.life = 1;
    this.sprite = b_sprite;
    this.name = name;
}
bullet.prototype.draw = function(context) {
    this.sx += this.speed * Math.sin(toRadians(this.rot));
    this.sy += this.speed * Math.cos(toRadians(this.rot));
    this.x += this.sx;
    this.y -= this.sy;
    var cSpeed = Math.sqrt((this.sx*this.sx) + (this.sy * this.sy));
    if (cSpeed > this.maxSpeed) {
        this.sx *= this.maxSpeed/cSpeed;
        this.sy *= this.maxSpeed/cSpeed;    
    }
    context.drawImage(this.sprite,this.x,this.y);
}

Anyway, when i run my game and press the spacebar, the Chrome developer console gives me an error that says:

Uncaught TypeError: Object function (x,y,rot,name) {
    this.x = x;
    this.y = y;
    this.sx = 0;
    this.sy = 0;
    this.speed = 1;
    this.maxSpeed = 10;
    this.rot = rot;
    this.life = 1;
    this.sprite = b_sprite;
    this.name = name;
} has no method 'draw'

even though i prototyped it. What am I doing wrong?

EDIT:

after changing var bullet = function to function bullet and changing bullet.prototype.draw to bullet.draw, I still get an error. This time, it's more mysterious, saying

Uncaught TypeError: type error
    bullet.draw
    (anonymous function)
    eGi.drawObjs
    eGi.cycle

the full code is up on my website, here

ANOTHER EDIT:

The Chrome console says that this type error occurs on line 122, which happens to be the snippet of code:

context.drawImage(this.sprite,this.x,this.y);

however, i'm not sure how there could be a type error there, the sprite is an Image, and the X and Y values are not undefined, they are numbers.

Answer 1

Where are you calling your draw function? I'm betting you're calling bullet.draw(); instead of calling it on an actual bullet instance.

Kinda like the difference between

Cat.meow();

and

var mittens = new Cat();
mittens.meow();