Run ruby script in terminal with parameters

Question

How would I run this method in terminal/irb and test out different parameters?

def add(*numbers)
 numbers.inject(0) { |sum, number| sum + number }
end

i.e trying the parameters 4 & 6 I would think something like: ruby add_method.rb 4,6 or ruby add_method.rb(4,6) but can't find/figure out the exact execution code to make it work. When I run those I get no return just a new prompt.

• August: Why not paste that method into IRB and then call add 4, 6?

Answer 1

Save it to a file like this:

def add(*numbers)
 numbers.inject(0) { |sum, number| sum + number }
end
result = add(*ARGV.map(&:to_i))
puts result

Then run it like ruby add_method.rb 4 6.

Answer 2

Put the below code in a file add.rb :

def add(numbers)
 numbers.inject(0) { |sum, number| sum + number.to_i }
end
puts add(ARGV)

Now run as

ruby add.rb 1 2 3

And you will get the output as - 6.

Read about ARGF -

ARGF is a stream designed for use in scripts that process files given as command-line arguments or passed in via STDIN....

• pjs: Bracket the test code with if __FILE__ == 0ドル; ...; end so the test case only gets run when add.rb is directly invoked, but not when it is loaded by another script.
• Jadam: How would I do it with still keeping that splat operator? It was the focus on this lesson I'm doing.
• pjs: @Jadam See konsolebox's answer to retain splat.