What this snippet does
Generic types require type arguments when instantiated, unlike generic functions which can infer them.
Expected output
Compile Error: Generic type 'Box' requires 1 type argument(s).
Why practise typing this
Typing generics 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
- Writing a basic identity functionGenerics · intermediate
- Creating a generic API fetcherGenerics · intermediate
- Assuming generic types have specific methodsGenerics · intermediate
- Defining a generic box interfaceGenerics · intermediate
- Defining a generic pagination responseGenerics · intermediate
- Constraining a generic to have a length propertyGenerics · intermediate