One case is when writing functions that operate on container-types defined by the language: slices, maps and channels.

If a function has parameters with these types and the function code makes no specific assumptions about the types of elements, it can be useful to use a type-parameter.

Another case where type-parameters can be useful is for general purpose data structures.

A general purpose data structure is something like a slice or a map, but not built into the language like a linked-list or a binary tree.

p> For more information on when to use generics, see an article by clicking here