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I was looking at some code examples and I came across this line:
puts "child #$$ accepting..."
which outputs
>> child 7231 accepting...
It looks like $$ is the PID and it's leveraging some shorthand for the normal #{$$} string interpolation syntax. I can't find the documentation for this though. I'm curious what other short hand tricks are available (or going to confuse me).
Where are the docs? Why is this special?
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Use let to define a memoized helper method. The value will be cached across multiple calls in the same example but not across examples. Note that let is lazy-evaluated: it is not evaluated until the first time the method it defines is invoked.
(:let) is lazily evaluated and will never be instantiated if you don't call it, while (:let!) is forcefully evaluated before each method call.
RSpec is a testing tool for Ruby, created for behavior-driven development (BDD). It is the most frequently used testing library for Ruby in production applications. Even though it has a very rich and powerful DSL (domain-specific language), at its core it is a simple tool which you can start using rather quickly.
Ruby allows you to omit the braces for global ($var), instance (@var), and class (@@var) variables when doing string interpolation.
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