thunk

Just an experiment at this stage that may find its way into a real library.

A typewriter for use with the golang code generator gen.

Reasoning

Despite golang's claim of being ReallySimple™ there is a lot of hidden complexity in the interaction between Channels and Goroutines. It's very easy to mess this up and leak resources or deadlock. They're too low level of a primitive to reliably work with. Go's lack of support for generics makes this complexity difficult to abstract away (runtime type reflection not withstanding), so we're left with code generation.

Example

package main

import (
	"fmt"
	"time"
)

// +gen thunk slice:"Where,GroupBy[int]"
type User struct {
	id   int
	name string
	age  int
}

func getUsers() []User {
	time.Sleep(2 * time.Second)
	return UserSlice{
		{1, "Alice", 18},
		{2, "Bob", 18},
		{3, "Carley", 21},
		{4, "David", 16},
	}

}

var isOver18 = func(u User) bool { return u.age >= 18 }
var age = func(u User) int { return u.age }

func main() {
	result := UsersThunk(getUsers).
		Timeout(1 * time.Second).
		Force().
		Where(isOver18).
		GroupByInt(age)

	fmt.Println("Result is", result)
}