What this snippet does
Interfaces act as contracts across your codebase to ensure consistent data structures.
Expected output
99.99
Why practise typing this
Typing objects and interfaces 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 and using a simple interfaceObjects and Interfaces · beginner
- Adding an excess property to an interfaceObjects and Interfaces · beginner
- Using optional and readonly modifiersObjects and Interfaces · beginner
- Defining an immutable user profileObjects and Interfaces · beginner
- Attempting to reassign a readonly propertyObjects and Interfaces · beginner
- Passing an exact object literal to an interfaceObjects and Interfaces · beginner