> my email is not a string, it's a email Here's the documentation for custom types in F#: http://fsharpforfunandprofit.com/posts/conciseness-type-definitions/

> my email is not a string, it's a email Here's the documentation for custom types in F#: http://fsharpforfunandprofit.com/posts/conciseness-type-definitions/ http://fsharpforfunandprofit.com/posts/conciseness-type-defi... http://fsharpforfunandprofit.com/series/understanding-fsharp-types.html http://fsharpforfunandprofit.com/series/understanding-fsharp... http://fsharpforfunandprofit.com/series/designing-with-types.html http://fsharpforfunandprofit.com/series/designing-with-types... Types are a very good way to model your data strictly.