We have defined our first game object, which represents our player's spaceship, but all we can do is fly around the game screen. We need to allow our player to shoot a projectile. If we created a new projectile object every time a player shot a projectile, we would quickly fill up the WASM module's memory. What we need to do is create what is known as an object pool. Object pools are used to create objects with a fixed lifespan. Our projectiles only need to be alive long enough to either hit a target or travel a fixed distance before disappearing. If we create a set number of projectiles that is a little more than we need on the screen at one time, we can keep those objects in a pool in either an active or inactive state. When we need to launch a new projectile, we scan our object pool for an inactive one, then activate it and place it at the launch point...
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