new ( 20 ) # Empty array with 20 nil elements array = Array. rb extension for filename passed to require and require_relative.Īrray = Array.
Avoid more than three levels of block nesting. Do not mutate parameters unless that is the purpose of the method. Use module instance variables instead of global variables. Some people, when confronted with a problem, think "I know, I’ll use regular expressions." Now they have two problems - Jamie Zawinski. Prefer map over collect, find over detect, select over find_all, reduce over inject, include? over member?, size over length. Set implements a collection of unordered values with no duplicates. 
Use Set instead of Array when dealing with unique elements. Constants within a Block must NOT be in uppercase or they will be defined globally. Don’t go off leaving everything public (which is the default). Assign proper visibility levels to methods (private, protected) in accordance with their intended usage. Avoid the usage of class variables due to their "nasty" behavior in inheritance. Always supply a proper to_s method for classes that represent domain objects. Classes should be used only when it makes sense to create instances out of them. Prefer modules to classes with only class methods. 
Don’t use DateTime unless you need to account for historical calendar reform - and if you do, explicitly specify the start argument to clearly state your intentions.Avoid (in)equality comparisons of floats as they are unreliable.Use of require should be reserved for external dependencies For all your internal dependencies, you should use require_relative.
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