'send' in Ruby

send

Calling a method when method name is stored as a string object in a variable i.e. you can not see which method to call.

example 1
when method name is simply stored as a String object

1. class C
2. def wish
3. p "hello world"
4. end
5. end
6. a = "wish"
7. c = C.new
8. c.send(a)

example 2
making set method at runtime

1. class C
2. attr_accessor :name
3. end
4. 
   
5. c = C.new
6. 
   
7. a = "name"
8. 
   
9. c.send(a + "=", "Arun")
10. 
    
11. p c.send(a)

example 3
this is interesting, when attribute name itself is send

1. class C
2. attr_accessor :send
3. end
4. 
   
5. c = C.new
6. 
   
7. a = "send"
8. 
   
9. c.__send__(a + "=", "Arun")
10. 
    
11. p c.__send__(a) # => Arun