Error: The function Object.setup() is undefined

I'm having an issue with my JavaScript setup function and array of ghost objects called ghosts. When I try to call the setup function on the last ghost object in the array, I receive this error message: Uncaught TypeError: ghosts[(ghosts.length - 1)].setup is not a function

The currentWords variable contains an array of strings that is used within the setup function for creating a new Ghost at set intervals.

var Ghost=function()
        {
            this.ghostPic='<img src="ghost.png">';
            this.x=Math.floor(Math.random()*500);
            this.y=Math.floor(Math.random()*500);
            this.speed=5;
            this.width=230;
            this.height=180;
            this.firstH=2000;
            this.dead = false;
            this.word = currentWords[Math.floor(Math.random()*currentWords.length)];
        }
Ghost.prototype.setup=function()
        {
            this.ghostElement=$(this.ghostPic);
            console.log('1');
            this.ghostElement.css({
                height:this.height-=2000,
                width:this.width-=2000,
                position:"absolute",
                zIndex:-1,
                left:this.x,
                top:this.y
            });
            console.log("2");
            $('body').append(this.ghostElement);
        }

To initialize the setup function, I am using the following code:

ghosts.concat(new Ghost());
ghosts[ghosts.length-1].setup();

If anyone has any insights or solutions to this issue, I would greatly appreciate it. Thank you!

Answer №1

When it comes to arrays, using .concat is a great way to combine them without altering the original array. Have you considered using ghosts.push instead?

Answer №2

you have two options:

spirits.push(new Spirit());

or

spirits = spirits.concat(new Spirit());

this is because the function Array.prototype.concat will create a new array, while Array.prototype.push will modify the existing array.

By the way, make sure to start by initializing the spirits array before using push or concat like so;

var spirits = [];

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