How do I select variables in an array (A) with values from a variable (B)

Question

I'm developing a video game using JavaScript and html Canvas and I'm trying to make it so that depending on what value:

PlayerIcon = 0;

is, the computer will draw that specific number from an array:

PlayerI = [];
PlayerI[0] = new Sprite("");
PlayerI[1] = new Sprite("");
PlayerI[2] = new Sprite("");

I don't exactly understand how undefined values work (eg .this [i]) But it should be possible with them right? I already know how to do this in JavaScript however I would like to be able to make this into only a few lines of coding (no matter how many variables I add to the array):

var canvas = document.getElementById("myCanvas");
var ctx = canvas.getContext("2d");
var timer = setInterval(gameLoop,10);
var PlayerIcon = 0;
var PlayerI = [];

function gameLoop()
{
if(PlayerIcon == 0)
{
PlayerI[0].draw(ctx);
}
if(PlayerIcon == 1)
{
PlayerI[1].draw(ctx);
}
if(PlayerIcon == 2)
{
PlayerI[2].draw(ctx);
}
}

then I will assign a picture to each PlayerI variable and switch which one is being displayed with the PlayerIcon variable.

Sebastiaan van Arkens · Accepted Answer · 2017-06-01 20:09:07Z

3

PlayerI[PlayerIcon].draw(ctx); should do the trick

answered Jun 1, 2017 at 20:09

Sebastiaan van Arkens

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4 Comments

Nathan Martin Over a year ago

Wait really? I didn't know it's that easy!

Nathan Martin Over a year ago

I just tried it and it worked! Thanks a ton! (I kinda feel bad posting this question now because it was so easy XP)

Sebastiaan van Arkens Over a year ago

Don't worry, we all had to learn and figure out at some point. Good luck with your game

Nathan Martin Over a year ago

True. Thank You!

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