using tk in ruby, when I add my_array to a listbox it adds all the items as a single large string. when I add them as *my_array it puts them in correctly.
I got *my_array from a example on web, but I don't know what it means.
~S
It expands the array into arguments. For example:
my_array = [ "str1", "str2", "str3" ]
listbox.add(*my_array)
is the same as
listbox.add("str1", "str2", "str3")
Many Ruby APIs make it easier on the developer by automatically expanding the array if it's the lone argument, but I guess tk doesn't, at least not in this case.
-- Brian Palmer
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On Sep 30, 2005, at 1:56 PM, Shea Martin wrote:
using tk in ruby, when I add my_array to a listbox it adds all the items as a single large string. when I add them as *my_array it puts them in correctly.
I got *my_array from a example on web, but I don't know what it means.
~S
Hi --
using tk in ruby, when I add my_array to a listbox it adds all the items as a single large string. when I add them as *my_array it puts them in correctly.
I got *my_array from a example on web, but I don't know what it means.
It "un-arrays" the array, turning it back into a plain list of
objects. For example:
a = [3,4,5]
b = [1,2,*a] # [1,2,3,4,5]
as opposed to:
b = [1,2,a] # [1,2,[3,4,5]]
It also plays a role in method calls. This:
def x(*args)
is a method that can take any number of arguments (including zero),
and will store them in the array args.
David
···
On Sat, 1 Oct 2005, Shea Martin wrote:
--
David A. Black
dblack@wobblini.net
Shea Martin wrote:
using tk in ruby, when I add my_array to a listbox it adds all the items as a single large string. when I add them as *my_array it puts them in correctly.
I got *my_array from a example on web, but I don't know what it means.
method(*[1, 2, 3]) is the same as method(1, 2, 3).