本当に怖いパフォーマンスが悪い実装 #phpcon2013(Video of these slides here http://fsharpforfunandprofit.com/ddd) Statically typed functional programming languages like F# encourage a very different way of thinking about types. The type system is your friend, not an annoyance, and can be used in many ways that might not be familiar to OO programmers. Types can be used to represent the domain in a fine-grained, self documenting way. And in many
