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I have a doubt on the lambda literal syntax corresponding to that (more classic) lambda syntax:
lambda { |foo| }
Is the following correct?
->(foo) {}
Thank you.
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In Ruby, a lambda is an object similar to a proc. Unlike a proc, a lambda requires a specific number of arguments passed to it, and it return s to its calling method rather than returning immediately. proc_demo = Proc. new { return "Only I print!" }
There are only two main differences. First, a lambda checks the number of arguments passed to it, while a proc does not. This means that a lambda will throw an error if you pass it the wrong number of arguments, whereas a proc will ignore unexpected arguments and assign nil to any that are missing.
A Proc object is an encapsulation of a block of code, which can be stored in a local variable, passed to a method or another Proc, and can be called. Proc is an essential concept in Ruby and a core of its functional programming features.
That is correct. More information about that in the official documentation: http://www.ruby-doc.org/core-2.1.1/doc/syntax/literals_rdoc.html#label-Procs
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