Daigo Kawasaki emanon-was

すごいHaskellたのしく学ぼう！をScalaでやってみたメモ

はじめの第一歩
Hello 再帰！
高階関数

JSONが対応していない値をJSONに保存する方法

JSONは NaN / Infinity / -Infinity や Date 型等に対応していない。しかし、JavaScriptのJSONは、これらを解消する仕組みを持っている。それは JSON.parse の第二引数の reviver とJSON.stringify の第二引数の replacer だ。

注意が必要なのは、 Date 型は toJSON メソッドを持つため replacer に値が渡る前に文字列になってしまうこと。これに対応するには toJSON メソッドを一時退避してしまえば良い。

これらを上手く駆使すれば、JSONに型を保ったまま値を保存し復元することができる。

At the beginning of 2030, I found this essay in my archives. From what I know today, I think it was very insightful at the moment of writing. And I feel it should be published because it can teach us, Rust developers, how to prevent that sad story from happening again.

What killed Haskell, could kill Rust, too

What killed Haskell, could kill Rust, too. Why would I even mention Haskell in this context? Well, Haskell and Rust are deeply related. Not because Rust is Haskell without HKTs. (Some of you know what that means, and the rest of you will wonder for a very long time). Much of the style of Rust is similar in many ways to the style of Haskell. In some sense Rust is a reincarnation of Haskell, with a little bit of C-ish like syntax, a very small amount.

Is Haskell dead?

	#!/bin/sh
	# Just copy and paste the lines below (all at once, it won't work line by line!)
	# MAKE SURE YOU ARE HAPPY WITH WHAT IT DOES FIRST! THERE IS NO WARRANTY!

	function abort {
	echo "$1"
	exit 1
	}

	set -e

	SPC
	SPC: find file
	, switch buffer
	. browse files
	: MX
	; EX
	< switch buffer
	` eval
	u universal arg
	x pop up scratch