I find myself repeatedly looking for a clear definition of the differences of nil?, blank?, and empty? in Ruby on Rails. Here’s the closest I’ve come: blank? objects are false, empty, or a whitespace string. For example, “”, ” “, nil, [], and {} are blank. nil? objects are instances of NilClass. empty? objects are … Read more
How do I call shell commands from inside of a Ruby program? How do I then get output from these commands back into Ruby? 2 22
I have a value ‘Dog’ and an array [‘Cat’, ‘Dog’, ‘Bird’]. How do I check if it exists in the array without looping through it? Is there a simple way of checking if the value exists, nothing more? 2 27 You’re looking for include?: >> [‘Cat’, ‘Dog’, ‘Bird’].include? ‘Dog’ => true
How do I write a switch statement in Ruby? 2 27 Ruby uses the case expression instead. case x when 1..5 “It’s between 1 and 5” when 6 “It’s 6” when “foo”, “bar” “It’s either foo or bar” when String “You passed a string” else “You gave me #{x} — I have no idea what … Read more
