Unity: Are you familiar with Awake(), OnEnable(), Start(), Update(),FixedUpdate() and OnDestroy()

There are so many articles on explaining the difference between the following built-in methods in Unity:

• Awake()
• OnEnable()
• Start()
• FixedUpdate()
• Update()
• OnDestroy()

Those methods are quite frequently used in Unity everyday.

TL;DR

Short version of the execution order:

Execution order

Difference between Awake(), OnEnable() and Start():

• Awake(): Is called only once in lifetime. No matter whether the script is enabled or not.
• OnEnable(): Is called when game object's status from "disable" to "enable".
• Start(): Called once in lifetime after Awake() but before Update(), also need this script to be enabled.

Difference between Update() and FixedUpdate():

Update(): Once per frame but not called on a regular timeline. High-end machine means more frames per second, which Update() is called more often than a normal machine. Some typical use scenarios are:

• The movement of non-physics object
• Detection of the input, such as mouse click, keyboard type, etc

FixedUpdate(): Called on a regular timeline and have the same intervals between calls. Some typical use scenarios are:

There is a video made by Unity officially explaining the difference: https://learn.unity.com/tutorial/update-and-fixedupdate

OnDestroy(): Will be called when the game object is destroied. For example, when the character died, and I want some explosion effects. For example:

Reference

Suggest you to have a good read on those following docs:

• https://docs.unity3d.com/ScriptReference/MonoBehaviour.Start.htm
• https://docs.unity3d.com/ScriptReference/MonoBehaviour.Awake.html
• https://docs.unity3d.com/Manual/ExecutionOrder.html

Originally published at https://needone.app on June 15, 2020.