Passing array instead of individual parameters?

Ruby
1

[New to this fine language, from a Perl background]

I expected (wrongly) the following to work -

def myroutine(one, two, three)
puts “first: #{one} second: #{two} third: #{three}”
end

myroutine(‘brave’, ‘new’, ‘world’) # as expected

The unexpected (to me)

myparamlist = [‘brave’, ‘new’, ‘world’]

myroutine(myparamlist) # fails

So, my question is - is there a way of calling a routine expecting N
parameters with a list containing N elements instead?

Specifically, using the dbi module, I expected to be able to say:

sth.prepare(“insert into foo (one, two, three) values (?, ?, ?)”)
sth.execute(my_list_of_three_values)

but instead I need to loop through the list and bind each one in turn?

Many thanks,

stefan

2

On Nov 10, 2008, at 8:05 AM, Stefan Kruger wrote:

The unexpected (to me)

myparamlist = [‘brave’, ‘new’, ‘world’]

myroutine(myparamlist) # fails

So, my question is - is there a way of calling a routine expecting N
parameters with a list containing N elements instead?

myroutine(*myparamlist)

3

Alle Monday 10 November 2008, Stefan Kruger ha scritto:

myroutine(myparamlist) # fails

So, my question is - is there a way of calling a routine expecting N
parameters with a list containing N elements instead?

myroutine(*myparamlist)

The *, when put in front of an array in an argument list transforms each
element of the array in an argument to the method. It is sometimes
called the
“splat operator”, even if it’s not a true operator.

Stefano