Class constant in CreateJS undefined - oop

Question

I am trying to create a constant named "SPEED" for a "Main" class in Adobe Animate. Below is my code.
function Main(){
this.update.bind(this));
}
Main.SPEED = 3.0;
Main.prototype.update = function(evt){
console.log("SPEED"+SPEED);
console.log(5+SPEED);
}
The problem is that it displays as undefined.
If I try to do some calculations with it the result is NaN.
The sample of the console feed can be viewed here.
What would be the cause of this?

Answer 1

You have defined correctly your constant:
Main.SPEED = 3.0;
But you are not using it. In your code, you defined Main.SPEED, but in your update function you're using SPEED, a variable you haven't defined:
Main.prototype.update = function(evt){
console.log("SPEED"+SPEED); // SPEED is not defined
console.log(5+SPEED);
}
Try the following code. In this one, I defined your constant, and a speed property of the Main function, setted to 0. In each tick, the value of the constant is added to the speed property.
function Main(){
this.speed = 0;
createjs.Ticker.addEventListener("tick", this.update.bind(this));
}
Main.SPEED = 3.0;
Main.prototype.update = function(evt){
this.speed += Main.SPEED;
console.log("SPEED: " + this.speed);
}
var main = new Main();