Lesson 34 of 55
15 mins readStatic Members and Readonly Modifiers
In Plain English
Static members belong to the class constructor function itself rather than instances. Readonly fields can only be initialized at declaration or inside the constructor.
Core Rules to Remember
Static Members: Accessed via ClassName.member without creating class instances.
Readonly Fields: Guarantees property values cannot be mutated after construction.
Live Interactive Example
Hit Run Code to see it liveStatic Methods and Constants
Python 3.12
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Output Console
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How it works: Static properties are referenced via MathUtils and shared across all instances.
Your Turn: Micro Challenge
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Micro Exercise
Create an Id Generator Factory
- Create class IdFactory with private static nextId: number = 1000.
- Add public static generate(prefix: string): string that returns `${prefix}_${IdFactory.nextId++}`.
- Generate two IDs with prefix "req" and print them separated by ", ".
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Sandbox Output
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