ruby - What is the flow? What is `initialize` doing? -

i picked tutorials need use initialize. here's portion of code:

class temperature   def initialize(c: nil, f: nil)     @fahrenheit = f     @celsius = c   end   def in_celsius     @celsius ||= (@fahrenheit - 32) * 5.0 / 9   end end 

here's rspec test:

describe "in degrees celsius"   "at 50 degrees"     temperature.new(:c => 50).in_celsius.should == 50   end 

when tests chunk above, value 50 attached key :c. @celsius = c mean c value of :c key? new method automatically direct initialize method?

in ruby .new creates new object , calls .initialize method on object. if there no initialize method declared calls initializer on superclass.

so when call temperature.new(c: 15) pass arguments initialize method:

def initialize(c: nil, f: nil)   # arguments in here passed .new   @fahrenheit = f # alters temperature instance   @celsius = c # alters temperature instance   puts self.inspect # show self new temperature instance end 

on side note:

its not @intialize since @ sign denotes instance variable. initialize method. when writing methods convention write foo#bar instance methods , foo.bar class methods.