What this snippet does
The readonly modifier ensures a property can only be assigned during initialization or in the constructor.
Expected output
1
Why practise typing this
Typing classes code builds muscle memory for the symbols and indentation TypeScript uses most, which prose-based typing tests never cover. DevType measures your words per minute and accuracy on this snippet and tracks the individual characters you mistype, so later lessons can target them.
More TypeScript practice
- Defining a simple class with a methodClasses · beginner
- Creating an invoice entity classClasses · beginner
- Accessing a class property before initializationClasses · beginner
- Using public, private, and protected modifiersClasses · beginner
- Protecting internal state of a bank accountClasses · beginner
- Accessing a private member from outside the classClasses · beginner