Join the social network of Tech Nerds, increase skill rank, get work, manage projects...
 

  • find_all method in ruby.

    @gaurav.jhaldiyal
    Recommendations Offline Message

    • 0
    • 0
    • 0
    • 0
    • 0
    • 0
    • 0
    • 0
    • 915
    Comment on it

    The find_all method has to do with arrays in Ruby.This method simply iterates through all the elements in an array and meanwhile test each of them against a test condition and finally returns an array containing all elements for which the test returned a true value.

    However ,we must note  that it uses a block to run that test condition .

    1. gauravjhadiyal@gauravjhadiyal:~$ irb
    2. 2.1.5 :001 > ['x','y','z'].find_all {|element| element > 'z'}
    3.  => [] 
    4. 2.1.5 :002 > ['x','y','z'].find_all {|element| element < 'z'}
    5.  => ["x", "y"] 
    6. 2.1.5 :003 > ['x','y','z'].find_all {|element| element > 'a'}
    7.  => ["x", "y", "z"] 
    8. 2.1.5 :004 > ['x','y','z'].find_all {|element| element >= 'y'}
    9.  => ["y", "z"] 
    10.  

    If we are interested in finding out its internal working details ,please follow the below given pseudo code (bear in mind it isn't the actual implementation ) :

    1. class Array
    2.  
    3.    def find_all
    4.      match_items = []
    5.      self.each do |item|
    6.         if yield(item)
    7.           match_items << item      
    8.         end   
    9.      end
    10.    end 
    11.  
    12. end

    so ,in order to recapitulate it ,the find_all method passes each element to a block and test each of them  against the test condition  and depending on the result pushes them into a brand new array.

    Thanks for reading .

     

    Ruby RubyonRails RAILS internal working array important methods arrays in ruby find all
    Comment on it

 0 Comment(s)

Sign In
Forgot Password?
                           OR                           
Create an account !!
                           OR                           
Register

Sign up using

                           OR                           
Forgot Password
Reset Password
Fill out the form below and reset your password: