The missing go functions and types.

Go is a powerful language, but some people believe quite strongly that it is missing some key functionality. This library attempts to address that. Contributions are welcome.


Just like any other library, but see the next section for an idea to reduce typing.

go get 

Usage (alias library name)

While you can use this library like any other, the missing prefix for every type and function can be a bit annoying. So you might want to do something like.

import M ""

func Main() {
    var mylist M.List[int]
    fmt.Printf("7 * 3 %s 21", M.If(7 * 3 == 21, "is", "is not"))

List methods.

A slice of a comparable type that has some additional methods (see GenericList for any type).

With a normal slice the x = append(x, val) is not exactly intuative, and seems quaint when considering other languages. It is quite reasonable as to why, but the missing.List type makes slices more object-oriented. Note: Underneath a List is just a slice, and you can do anythign to a List that you can to a slice.

A missing.List is a slice that has some useful functions — see godoc for full documentation, but an overview is:

  • Append(vals...) // Appends the values to the list
  • Prepend(vals...) // Prepends the values to the list
  • Contains(val) // Returns true if the list contains a value
  • Insert(idx, vals...) // Inserts the vals at the specified index in the list. Panics if out of bounds
  • Len() // Returns the length of the list. This is literally just len(list), but is here because why not?
  • Foreach(fn) // Calls the provided function for each item in the list. You probably just want to use a normal for loop
  • Sort(fn) // Sorts the list inplace.


A generic list is a list, but is missing Contains as unlike a List a generic list can be any type, it doesn’t need to be comparable. Otherwise it is functionaly identical to List.


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