Keyword arguments in Ruby

[grom]

Is it possbile for Ruby to have keyword arguments added in like in
Python.

Quote from Python documentation:

4.7.2 Keyword Arguments
Functions can also be called using keyword arguments of the form
"keyword = value". For instance, the following function:

def parrot(voltage, state='a stiff', action='voom', type='Norwegian
Blue'):
print "-- This parrot wouldn't", action,
print "if you put", voltage, "Volts through it."
print "-- Lovely plumage, the", type
print "-- It's", state, "!"

could be called in any of the following ways:

parrot(1000)
parrot(action = 'VOOOOOM', voltage = 1000000)
parrot('a thousand', state = 'pushing up the daisies')
parrot('a million', 'bereft of life', 'jump')

but the following calls would all be invalid:

parrot() # required argument missing
parrot(voltage=5.0, 'dead') # non-keyword argument following keyword
parrot(110, voltage=220) # duplicate value for argument
parrot(actor='John Cleese') # unknown keyword

 

[Mauricio Fernández]

Is it possbile for Ruby to have keyword arguments added in like in
Python.

http://www.rubyist.net/~matz/slides/rc2003/mgp00026.html

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[gabriele renzi]

il 24 Jan 2004 22:09:53 -0800, (e-mail address removed) (grom) ha
scritto::

Is it possbile for Ruby to have keyword arguments added in like in
Python.

They're going to be added in ruby2.0.

In the meanwhile you can
use instance eval to have something like this:
Parrot.new{action='voom'; type='norwegian blue'} like in the bindings
for Tk.
Or use an hash to do something like this:
Parrot.newaction=>'voom',:type=>'norwegian_blue')

 

[gabriele renzi]

il 24 Jan 2004 22:09:53 -0800, (e-mail address removed) (grom) ha
scritto::

Is it possbile for Ruby to have keyword arguments added in like in
Python.

I supposed I answered but my msg didn't show up on comp.lang.ruby.
Sorry if I double post:

kwd args are goin to be included in ruby2.0
Until that you can emulate them via instance_eval like in tk

Parrot.new{state='a stiff'}
or explicitly using an hash:
Parrot.newstate=>'a stiff')

 

[Michael campbell]

http://www.rubyist.net/~matz/slides/rc2003/mgp00026.html

It might be instructive for the newcomers to note that this slide refers to "visions for the future", not current functionality.