2D Galaxy Shooter — Explaining Variables

Hello all!

Today, I will be talking about variables! Variables are used as building blocks for programming.

An example of this would be health. Games don’t know that we die if we get hit three times without a variable setting our health.

Most of the time, you will add your variables right under the “MonoBehavior”.

There are three things a variable need with an optional fourth:
a public or private reference, data type, a name, and an optional value.


References can either be public or private depending on what you need it for. Let’s use the speed of my player for example, not everyone needs to see the speed of my player, so I would set this to private. Now say that you are adding a health variable in a shooter, you would want them public so your enemies can have access to the script and hurt you.

With private references, it is a best practice to always add an underscore before the name of your variable, like “private float _speed = 3.5f;”

Also, you can always change private references where it can be seen in the inspector anyways using a [SerializeField] behind the variable

Speed for my Player!

Data Types

There are four very useful data types in variables:

  1. Bool — True or false
    public bool blueSky = true;
  2. Float — Decimal value
    public float pi = 3.14159265359f;
    Note: “f” is required after any decimal value
  3. Int — Whole value
    public int year = 2021;
  4. String — Names
    public string myName = “Marcus Cohee”;


Names are used to reference the variable in the code.

We use Camel Casing for our names here. For example: “myName” would look like “My Name” in the inspector when looking at the script tab.

Optional Value

The last part of the variable is to give it a value. To start out with, they are given the value of 0, false, or nothing. That 0 can get messy if used with multiplication, so it’s usually a good idea to add a value.

That’s how variables work!

Thank you for your time!



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Marcus Cohee

Marcus Cohee


I am starting Unity and learning the ropes as I go! Let’s take this journey together!