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I want to use an options hash as input to a method in Ruby, but is there a way to quickly set all eponymous variables (i.e having the same name) instead of setting each individually?
So instead of doing the following:
class Connection def initialize(opts={}) @host = opts[:host] @user = opts[:user] @password = opts[:password] @project = opts[:project] # ad nauseum... is there a one-liner that will assign each incoming option in the hash to the variable with the same name?
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The ruby instance variables do not need a declaration. This implies a flexible object structure. Every instance variable is dynamically appended to an object when it is first referenced. An instance variable belongs to the object itself (each object has its own instance variable of that particular class)
In the Ruby programming language, an instance variable is a type of variable which starts with an @ symbol. An instance variable is used as part of Object-Oriented Programming (OOP) to give objects their own private space to store data.
Ruby Class VariablesClass variables begin with @@ and must be initialized before they can be used in method definitions. Referencing an uninitialized class variable produces an error. Class variables are shared among descendants of the class or module in which the class variables are defined.
The initialize method is part of the object-creation process in Ruby and it allows us to set the initial values for an object. Below are some points about Initialize : We can define default argument. It will always return a new object so return keyword is not used inside initialize method.
def initialize(opts={}) opts.each { |k,v| instance_variable_set("@#{k}", v) } end If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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