crystal-lang - 可以将 Ruby gems 与 Crystal 一起使用吗？

Question

开发人员说 Crystal 遵循 Ruby 语言语法。那么我可以(或者我将来会)只需要一个 Ruby gem 并且它神奇地构建并正常工作等等？

Answer 1

不。

如今，该语言发展了很多，并且与 Ruby 有很大不同。虽然感觉有点像 Ruby，但如果您真的尝试一下，您将很快理解为什么除了您可以想象的最简单的 gem 之外，这个问题甚至不会出现。举两个例子:

Crystal 没有单引号字符串文字:

'c'        # Ok in Ruby and Crystal, but different things,
           # a String in Ruby, a Char in Crystal

"a string" # Ok in Ruby and Crystal, a String in both

'a string' # Ok in Ruby, but a compile time error in
           # Crystal, since character literals are for a single character

Crystal 无法推断空数组或散列的类型:

["foo"]                # Ok in Ruby and Crystal, an Array in Ruby,
                       # an Array(String) in Crystal

{"foo" => "bar"}       # Ok in Ruby and Crystal, a Hash
                       # in Ruby, a Hash(String, String) in Crystal

[]                     # Ok in Ruby, but a compile time error in Crystal
[] of String           # Ok in Crystal, but a syntax error in Ruby
{}                     # Ok in Ruby, but a compile time error in Crystal
{} of String => String # Ok in Crystal, but a syntax error in Ruby

您可以阅读更多信息，例如 here或 here .