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7 Cards in this Set
- Front
- Back
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Define "DSL". |
DSL = Domain Specific Language |
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What is an enumerable?
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From RubyDocs: "The Enumerable mixin provides collection classes with several traversal and searching methods, and with the ability to sort. The class must provide a method each, which yields successive members of the collection." Basically: curly brackets using "each" in lieu of a loop |
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What is the difference between an instance variable and a method in a class? |
Instance variables are what the object knows, while methods are things an object does. Source: http://rubylearning.com/satishtalim/writing_our_own_class_in_ruby.html |
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What two distinct features must classes have? |
State and Behavior source: http://rubymonk.com/learning/books/1/chapters/7-classes/lessons/40-building-your-own-class |
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What is the difference between a local and an instance variable? |
A local variable is only available inside the method where it is defined. An instance variable is bound to a specific class, making itself available for every method in that class. Source: https://rubymonk.com/learning/books/4-ruby-primer-ascent/chapters/45-more-classes/lessons/110-instance-variables |
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What is a getter method? What can be used as a subsitute? Hint: give an example using a theoretical class "Item" and an instance variable "description" |
A method who's sole purpose is to return the value of that particular instance variable. Example: class Item def initialize(description) @description = description end def description @description end end Substitute: attr_reader :description under class definition, and replaces bolded section in above example code Source: https://rubymonk.com/learning/books/4-ruby-primer-ascent/chapters/45-more-classes/lessons/110-instance-variables |
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What is a setter method? What can be used as a substitute? Hint: give an example using a theoretical class "Item" and an instance variable "description" |
A method that allows an instance variable to be changed from the outside. Example: class Item def initialize(description) @description = description end def description=(new_description) @description = new_description end def description @description end end Substitute: attr_writer :description under class definition, and replaces bolded section in example code Source: https://rubymonk.com/learning/books/4-ruby-primer-ascent/chapters/45-more-classes/lessons/110-instance-variables |
