What does wrong number of arguments 1 for 0 mean in Ruby

Question

What does  Argument Error  wrong number of arguments  1 for 0   mean

User · Answer

If you change from using a lambda with one argument to a function with one argument, you will get this error.

For example:

You had:

foobar = lambda do |baz|
  puts baz
end

and you changed the definition to

def foobar(baz)
  puts baz
end

And you left your invocation as:

foobar.call(baz)

And then you got the message

ArgumentError: wrong number of arguments (0 for 1)

when you really meant:

foobar(baz)

User · Answer

When you define a function  you also define what info  arguments  that function needs to work  If it is designed to work without any additional info  and you pass it some  you are going to get that error   Example  Takes no arguments   def dog end   Takes arguments   def cat name  end   When you call these  you need to call them with the arguments you defined   dog                   works fine cat  Fluffy           works fine   dog  Fido             Returns ArgumentError  1 for 0  cat                   Returns ArgumentError  0 for 1    Check out the Ruby Koans to learn all this

User · Answer

You passed an argument to a function which didn t take any  For example   def takes no arguments end  takes no arguments 1   ArgumentError  wrong number of arguments  1 for 0

User · Answer

I assume you called a function with an argument which was defined without taking any   def f     puts  hello world  end  f 1       lt   wrong number of arguments  1 for 0

[ruby] What does "wrong number of arguments (1 for 0)" mean in Ruby?

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