try.cr

Try monad for Crystal.

• crystal: 0.20.1

Usage

require "try"

i = Try(Int32) { 1 }              # => Success(Int32)
i.map(&.+ 1).value                # => 2

i = Try(Int32) { raise "error" }  # => Failure(Int32)
i.map(&.+ 1).value                # => Exception("error")

API

def success? : Bool
def failure? : Bool
def value : T
def get : T
def get? : T?
def failed : Try[Exception]
def foreach(&block : T -> U) : Nil
def map(&block : T -> U) : Try(U)
def flat_map(&block : T -> Try(U)) : Try(U)
def recover(&block : Exception -> U) : Try(U)

Installation

Add this to your application's shard.yml:

dependencies:
  try:
    github: maiha/try.cr

Development

make test

Contributing

1. Fork it ( https://github.com/maiha/try.cr/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request

Contributors

• maiha maiha - creator, maintainer