hashrocket

Can someone point me to a good primer just explaining the different syntactic features in Ruby/Rails? For instance, how come some examples I see do myMethod(x: "z") and others do myMethod(:x => "x") ? The syntax in general seems strange to me, just looking for a quick at-a-glance reference to use as a cheat sheet. MrYoshiji They are the same , it is just a matter of preferences. I also asked myself why would we add this new syntax if we already have one? Well, Programming with Ruby implies that we are lazy and want to type the less possible caracters. So this new syntax allow us - lazy

This question already has an answer here: What is the “equals greater than” operator => in Ruby? 1 answer While learning Ruby I've come across the "=>" operator on occasion. Usually I see it in the form of :symbol => value and it seems to be used frequently when passing values to functions. What exactly is that operator called? What does it do/mean? Is it built into Ruby or is it something that different frameworks like Rails and DataMapper add to the symbol class? Is it only used in conjunction with the symbol class? Thanks. => separates the keys from the values in a hashmap literal. It is

This question already has an answer here: Is there any difference between the `:key => “value”` and `key: “value”` hash notations? 5 answers What's the difference between colon : and fat arrow => in Ruby? Or when to use what? :foo => true foo: true JDutil The syntax is for defining Hash key/value pairs, and the difference depends on the Ruby version. Supported in both Ruby 1.8 and Ruby 1.9 :foo => true Supported only in Ruby 1.9 foo: true If you're developing in Ruby 1.9 you should probably use the syntax: foo: true as it appears to be the direction the community is moving in. Alex Peattie The

The well-cited RIP Hash rocket post would seem to imply the Hash Rocket syntax ( :foo => "bar" ) is deprecated in favor of the new-to-Ruby JSON-style hash ( foo: "bar" ), but I can't find any definitive reference stating the Hash Rocket form is actually deprecated/unadvised as of Ruby 1.9. The author of that blog post is being overly dramatic and foolish, the => is still quite necessary . In particular: You must use the rocket for symbols that require quoting: :'where.is' => x is valid but 'where.is': x is not. Ruby 2.2 has fixed this problem so you can say 'where.is': x in Ruby 2.2+. You must