Go-fun
Utilities and immutable collections for functional programming in Golang.
This is an experimental library to play with the new Generics Feature in Go 1.18.
Features
- Reducers for transforming data (map, filter, group by, etc)
- Immutable data structures
- List
- Mutable data structures
- Stack
- Iterable abstraction
- Equality type class
Examples
Take a slice of books and return a map where the keys are authors and the values contain all the titles of the books the author has written in or after the year 2000.
= 2000 }, reducer.GroupBy(func(b Book) string { return b.Author }, reducer.Map(func(b Book) string { return b.Title }, reducer.ToSlice[string]())))) require.Equal(t, map[string][]string{ "A": {"S"}, "B": {"R", "U"}, }, m) }">
type Book struct {
Author string
Title string
Year int
}
func TestBook(t *testing.T) {
books := []Book{
{"A", "Q", 1990},
{"B", "R", 2005},
{"A", "S", 2001},
{"B", "T", 1999},
{"B", "U", 2021},
}
m := reducer.ApplySlice(books,
reducer.Filter(func(b Book) bool { return b.Year >= 2000 },
reducer.GroupBy(func(b Book) string { return b.Author },
reducer.Map(func(b Book) string { return b.Title }, reducer.ToSlice[string]()))))
require.Equal(t, map[string][]string{
"A": {"S"},
"B": {"R", "U"},
}, m)
}
