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2023

Understand Monads

Monad is a fundamental concept in Haskell. Recently, I have reviewed them and made my mind clearer. Hence, I wrote down this blog. To understand them, we need to clearly understand some concepts, such as:

  • understand the do notation syntax sugar and learn about how de-sugar it to >>= format
  • understand the closures after de-sugaring
  • type constructor
  • understand how the >>= deals with the data held inside a monad
  • understand the runMonad function properly
  • clarify the difference between monad in category(math) and the monad in haskell
  • in LLVM

LLVM and GC

In this blog, I will introduce how I integrate a precise, relocation GC with LLVM using its statepoint api. We will also talk about some optimization techniques, debug support and so on.

Setting Up Debugger for Haskell in Vscode

It's not easy as the other languages which owns an IDE so click the button is the only thing need to do. Using Vscode, I installed several plugins and dependencies, then clicked debug button, oops, nothing happened! The debugger bar flashes and disappear, then nothing happened except the confusing people at the front of screen.

To be frank, I gave up several times when I was attacked by such a messy event. However, another afflict when I want to diagnose my program. After plowing in the troublesome problems, I finally set up it successfully. However, it becomes more messy when I changed my Desktop from Intel to M1, which means I need to set it up AGAIN.

This blog records some hints for setting up Haskell Debugger. I hope I will never set it up with so many trouble again.

Go Function Return Values: List, Not Tuple

Recently, I suddenly found that the following code line is weird, how could it pass (int, error) to ...any?

func main
func variadic(a ...any) {
    fmt.Println(a)
    return
}

func array(a []any) {
    fmt.Println(a...)
    return
}

func main() {
    variadic(json.Marshal(""))
    // array(json.Marshal(""))
    // ^ CANNOT PASS COMPILE
}