Ruby tutorial session 10

Ruby Assignment:

Hi Readers,

Today we are going learn assignment of a variable value in ruby.

Assignment:

• a, b = b, a # swapping values
• a = 1; b = 1
• a = b = 1
• a += 1 # a = a + 1
• a, b = [1, 2]
• a = b || c
• a ||= b

Idiom: Assignment with Boolean Expression

    comment = Object.new 
    def comment.user 
      Object.new 
    end 
     
    # Overly verbose: 
    user_id = nil 
    if comment 
      if comment.user 
        user_id = comment.user.object_id 
      end 
    end 
     
    # Idiomatic: 
    user_id = comment && comment.user && comment.user.object_id  

Practice the above mentioned statements in irb.

Hope you like this.

Thank you