GopherForgeA WORKBENCH FOR GO
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GO LEARNING PATH · 5 LESSONS

Generics, and when not to

Type parameters, constraints, and the times an interface is the better answer.

  1. A type parameter is written in square brackets

    Write a function that works for several types without interface{} and without a cast.

    3 min · Worked lesson

  2. A constraint is an interface with types in it

    Constrain a type parameter to what your code actually needs.

    3 min · Worked lesson

  3. A type can take parameters too

    Write a container that holds one type rather than any type.

    3 min · Worked lesson

  4. A method can take its own type parameter

    Write the method that could only be a function before Go 1.27.

    3 min · Worked lesson

  5. Most code that could be generic should not be

    Recognise the three cases where a type parameter earns its place, and the ones where it does not.

    3 min · Prediction challenge