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Using %W I can use %W[a #{} b #{} c], also I can concatenate arrays, but is it possible to create array ['a', '', 'b', '', 'c'] using just %w[]?

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no. %w[] has no way to represent zero-length string as an element. –  dbenhur Oct 19 '12 at 22:29
 
See also stackoverflow.com/questions/4064062/… (there the results contain a space - so it is a similar situation, not the same) –  knut Oct 23 '12 at 20:58
 
@knut: I know about escaping space, but that is not what I want –  tig Oct 24 '12 at 14:09
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2 Answers

up vote 0 down vote

You can use 

 %w[a \   b \  c].map(&:strip)

,but I think it's not very clean.

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A couple of options

%W[a b c #{''} z]

%W[a b c] << " "

(I know this isn't using the %w{} syntax, but for good measure:

'a,b,c,,z'.split(',')

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