C# in Unity

Question 1

What is a life cycle component?

Answer 1

A method attached to a game object that is called automatically as part of the GAME life cycle

Question 2

What methods are considered life cycle components?

Answer 2

Awake()

OnEnable()

Start()

FixedUpdate()

Update()

LateUpdate()

OnDisable()

OnDestroy()

Question 3

What is the Awake() method and how is it used?

Answer 3

Awake()
Initializes variables or game state.
Called when the script instance is loaded

Question 4

What is the OnEnable() method used for and when is it called?

Answer 4

OnEnable()
Use: Used to reset variables, states, or register for events like triggering a quest or objective.
When Called: When the object becomes enabled and active.

Question 5

What is the Start() method used for and when is it called?

Answer 5

Start()
Use: Sets up references between scripts, initializes game logic, or starts coroutines.
When Called: Before the first frame update if the script is enabled.

Question 6

What is the FixedUpdate() used for and when is it called?

Answer 6

FixedUpdate()
Use: Handles physics calculations, such as applying forces or adjusting rigidbody positions.
When Called: At a fixed frequency, independent of frame rate.

Question 7

What is the Update() method used for and when is it called?

Answer 7

Update()
Use: Main function for frame-dependent logic, such as receiving input, moving objects, or triggering game events.
When Called: Once per frame.

Question 8

What is the LateUpdate() method used for and when is it called?

Answer 8

LateUpdate()
Use: Executes code that needs to run after all Update() functions, such as camera follow scripts.
When Called: Once per frame, after Update().

Question 9

What is the OnDisable() method used for and when is it called?

Answer 9

Use: Unregister from events, stop coroutines, or reset game logic.
When Called: When the script is disabled or the object it’s attached to is deactivated.

Question 10

What is the OnDestroy() method used for and when is it called?

Answer 10

OnDestroy()
Use: Cleans up resources, saves state, or performs any necessary cleanup before the object is destroyed.
When Called: When the MonoBehaviour will be destroyed, either because the associated GameObject is being destroyed, or because the MonoBehaviour is being removed

Question 11

What is the purpose of a Using.name; statement?

Answer 11

To reference a class, allowing access to its methods and components
Example: using UnityEngine;

Question 12

What is MonoBehaviour and what is it use for?

Answer 12

It is a base class integrated with Unity to run all the life cycle functions along with added features.

Question 13

What is a member variable and how is it used?

Answer 13

It’s a partial description of a class object. Member variables store data for different parts of the class and can be named anything but need the “type” of member variable being used example: int score =100;
Can be public or private.

Question 14

What is the type “int” and how is it used?

Answer 14

Member variable to store whole numbers without decimal places. Example: int score = 100

Question 15

What is the type “float” and how is it used?

Answer 15

Member variable that stores an imprecise number with decimal places, commonly used for “speed, strength etc..”

Question 16

What is the type “bool” and how is it used?

Answer 16

Member variable that stores only true or false values, commonly used for toggles, flags and other binary state functions.

Question 17

What is the type “string” and how is it used?

Answer 17

Member variable that stores a string of characters or text, commonly used for names, info blocks etc..

Question 18

What is a life cycle?

Answer 18

The order in which the components and methods of the program are called.

Question 19

What is the type “char” and how is it used?

Answer 19

Member variable that stores a single character. Less common but can be used to parse individual characters from strings.

Question 20

What is type “double” and how is it used?

Answer 20

Similar to a float but with double the precision. Not often used in Unity due to performance issues.

Question 21

What is type “decimal” and how is it used?

Answer 21

Member variable that stores a number with decimals. High precision, commonly used in financial calculations but not often used in Unity.

Question 22

What is type “byte” and how is it used?

Answer 22

Member variable that represents an 8-bit signed integer. Can be used for small numerical values to save memory.

Question 23

What is type “sbyte” and how is it used?

Answer 23

Member variable that represents an 8-bit signed integer that allows positive and negative values. Can be used for small numerical values to save memory.

Question 24

What is type Vector, how many types are there and how are they used?

Answer 24

Member variables. Can be Vector 2, 3, or 4. Used for positions, directions, and dimensions in space.

Question 25

What is type Quaternion and how is it used?

Answer 25

Member variable representing rotation. Used instead of Euler angles to avoid gimbal lock.

Question 26

What is type GameObject and how is it used?

Answer 26

Member variable representing the literal game object, example: a sword, food item, potion.
Used to call gameObjects into the class.

Question 27

What is type transform and how is it used?

Answer 27

Member variable representing the position, rotation and scale of a game object in the scene.
Used when handling movement, spawns etc..

Question 28

What is an “Attribute?”

Answer 28

an “attribute” is a special keyword that you place above classes, methods, or variables to specify how they should behave in certain contexts. Attributes can control various aspects of how your code interacts with the Unity engine and editor.

Question 29

What is [Serialized Field] and how is it used?

Answer 29

Attribute that Allows private fields to be serialized and visible in the Unity Inspector.

Question 30

What is [HideInInspector] and how is it used?

Answer 30

Attribute that Hides public fields from the Unity Inspector.

Question 31

What is [Range(min, max)] and how is it used?

Answer 31

Attribute that Restricts a numerical field in the Inspector to a specified range and provides a slider for it.

Question 32

What is [ToolTip(“text”)] and how is it used?

Answer 32

Attribute that Adds a tooltip that appears when you hover over a field in the Inspector.

Question 33

What is [Header(“text”)] and how is it used?

Answer 33

Attribute, Adds a header above fields in the Inspector.

Question 34

What is [Space(height)] and how is it used?

Answer 34

Attribute, Adds vertical space in the Inspector between fields.

Question 35

What is [ContextMenu(“MethodName”)] and how is it used?

Answer 35

Attribute, Adds a context menu item to a component’s gear icon in the Inspector, which calls the specified method when selected.

Question 36

What is [RequireComponent(typeof(ComponentType))] and how is it used?

Answer 36

Attribute, Automatically adds required components as dependencies.

Question 37

What is [ExecuteInEditMode] and how is it used?

Answer 37

Attribute, Makes a script execute in edit mode, not just play mode.

Question 38

What is [ContextMenu(“ItemName”)] and how is it used?

Answer 38

Attribute, Adds a function to the context menu of the component in the Inspector.

Question 39

What is [HelpURL(“URL”)] and how is it used?

Answer 39

Attribute, Links to a web page from the component’s Inspector window.

Question 40

What is [Multiline] and how is it used?

Answer 40

Attribute, Allows for multi-line string input in the Inspector.

Question 41

What is [TextArea(minLines, maxLines)] and how is it used?

Answer 41

Attribute, Similar to Multiline but with control over the min and max lines.

Question 42

What is the difference between a primitive and Struct member variables?

Answer 42

Primitive member variable do not reference a class and so store small data.
Struct member variables are a reference to a class and so have access to their own methods and member variables as well.

Question 43

What is an Access Modifier?

Answer 43

An Attribute of a property that controls access to that property from outside the class.

Public
Private
protected
internal
protected internal
private protected

Question 44

What is the public access modifier used for?

Answer 44

• Accessible from any other class
• Use for variables you need to access from other scripts or want to expose in the Unity Inspector

Question 45

What is the Private access modifier used for?

Answer 45

• Only accessible within the same class
• Use for variables that should not be accessible from other scripts

Question 46

What is the protected access modifier used for?

Answer 46

• Accessible within the same class and derived classes
• Use for variables that should be available to any subclass

Question 47

What is the internal access modifier used for?

Answer 47

• Accessible only within the same assembly (usually the same project)
• Use for variables that should be limited to the project scope

Question 48

What is the protected internal access modifier used for?

Answer 48

• Accessible within the same assembly and from derived classes in any assembly
• Use for variables that should be protected but still available to subclasses anywhere

Question 49

What is the private protected access modifier used for?

Answer 49

• Accessible within the same class and derived classes in the same assembly
• Use for variables that need strict access control but should be available to subclasses

Question 50

What is Time.deltaTime and how is it used

Answer 50

Time refers to a Unity class with “.” referencing that it will use the following component from that class.
deltaTime is a class that allows the computer to track the time between frames, this allows the computer to display a smooth real-time effect instead of each frame.

Question 51

What is an if statement and how is it used?

Answer 51

An if statement is a fundamental control structure in programming that evaluates a condition and executes a block of code if the condition is true.