PlayerPrefs for simple data in Unity - Step-by-Step Execution

Concept Flow - PlayerPrefs for simple data

Start

↓

Set Key-Value

↓

Save Data

↓

Retrieve Data

↓

Use Data in Game

↓

End

PlayerPrefs stores simple data as key-value pairs, saving and retrieving values for game use.

Execution Sample

Unity

PlayerPrefs.SetInt("score", 10);
PlayerPrefs.Save();
int score = PlayerPrefs.GetInt("score", 0);
Debug.Log(score);

This code saves an integer score of 10 and then retrieves and prints it.

Execution Table

Step	Action	Key	Value	Result/Output
1	SetInt called	score	10	Value stored in PlayerPrefs memory
2	Save called	-	-	Data saved to disk
3	GetInt called	score	-	Returns 10
4	Debug.Log called	-	-	Prints 10 to Console
5	End	-	-	Execution complete

💡 All steps complete, data saved and retrieved successfully.

Variable Tracker

Variable	Start	After Step 1	After Step 2	After Step 3	Final
score	undefined	10 (in PlayerPrefs memory)	10 (saved)	10 (retrieved)	10 (used)

Key Moments - 2 Insights

Why do we call PlayerPrefs.Save() after SetInt?

PlayerPrefs.SetInt stores data in memory, but PlayerPrefs.Save writes it to disk. Without Save, data might not persist after the game closes (see execution_table step 2).

What happens if the key does not exist when calling GetInt?

GetInt returns the default value provided (0 in this example). This prevents errors and ensures a known value (refer to execution_table step 3).

Visual Quiz - 3 Questions

Look at the execution table, what value does GetInt return at step 3?

A 0

B 10

C null

D Error

💡 Hint

Check the 'Result/Output' column at step 3 in the execution_table.

At which step is the data actually saved to disk?

A Step 2

B Step 1

C Step 3

D Step 4

💡 Hint

Look for the action 'Save called' in the execution_table.

If we skip PlayerPrefs.Save(), what might happen?

A Data is saved anyway

B Game crashes

C Data is lost when game closes

D Data doubles

💡 Hint

Refer to key_moments explanation about Save importance.

Concept Snapshot

PlayerPrefs stores simple data as key-value pairs.
Use SetInt, SetFloat, SetString to save data.
Call PlayerPrefs.Save() to write data to disk.
Use GetInt, GetFloat, GetString to retrieve data with a default.
Good for small, simple game settings or scores.

Full Transcript

PlayerPrefs is a Unity feature to save simple data like numbers or text. You store data by giving it a key name and a value using SetInt, SetFloat, or SetString. After setting data, you call PlayerPrefs.Save() to make sure it is saved on the device. Later, you can get the data back using GetInt, GetFloat, or GetString by using the same key. If the key does not exist, you get a default value you provide. This is useful for saving scores, settings, or small pieces of information between game sessions.