Harry Ohlsen
11/5/2004 12:19:00 AM
Hi,
One of my colleagues asked me last night how he could do some processing
on every object of an array, with different processing for the first
item ... but without generating an intermediate variable.
An example would be doing the equivalent of
puts a.join(", ")
without having a temporary string created. The temporary string isn't
an issue normally, but imagine if the array is huge.
Trying to make it reasonably flexible, I came up with the following, but
I figure there's probably some cleaner way to do it.
Maybe there's a method I don't know about that allows for this kind of
thing. Any suggestions?
Pardon the method name ... it's only a model :-)
class Array
def first_and_rest(first_time)
first_time.call self[0]
(1 .. self.length - 1).each do |i|
yield self[i]
end
end
end
a = [1, 2, 3, 4, 5]
File.open("test.txt", "w") do |out|
a.first_and_rest(proc {|x| out.print x}) do |x|
out.print ", #{x}"
end
out.puts
end
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