Generics when to use them and when it’s not:

Common useful cases:

• Implementation of Data Structures that help us factor out the element type if we used the binary tree, linked list, …
• Function working with slices, maps and channels

Common not useful cases:

• When calling a method of the type argument Consider a function that receives an io.Writer and calls the Write method, for example:

func foo[T io.Writer](w T) {
b := getBytes()
_, _ = w.Write(b)
}

In this case, using generics won’t bring any value to our code whatsoever. We should make the w argument an io.Writer directly.

• When it makes our code more complex, Generics are never mandatory, and as Go developers, we have lived without them for more than a decade. If we’re writing generic functions or structures and we figure out that it doesn’t make our code clearer, we should probably reconsider our decision for that particular use case.