Ruby "don't care variable" same as Prolog's?
30206
Where and how is the _ (underscore) variable specified?
102826
Easy way to check that a variable is defined in python?
49009
Variable scope similar to other languages
94806
Is ||= in Ruby thread safe?
32547
Ruby variable name with double underscores
135516
Anything similar in javascript to ruby's #{value} (string interpolation)
94403
Is there an inverse 'member?' method in ruby?
10475
Operator precedence for  And/&& in Ruby
30733
Negation as failure in Prolog is a procedural behavior?
118858
Is there any way to negate a Predicate?
135810
Why doesn't Ruby support i++ or i--​ (increment/decrement operators)?
98704
Is There a Better Way of Checking Nil or Length == 0 of a String in Ruby?
55447
What do Ruby's printf arguments mean?
51040
Passing multiple code blocks as arguments in Ruby
153286
When to use `self.foo` instead of `foo` in Ruby methods
35700
Ruby block and unparenthesized arguments
141386
What are <-- Ruby Strings called? And how do I insert variables in them?