I have some array
>> a = ["a..c", "0..2"]
=> ["a..c", "0..2"]
I need convert this array to another array
>> b = ("a".."c").to_a + (0..2).to_a
=> ["a", "b", "c", 0, 1, 2]
How I can do it?
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3 Answers
a.flat_map do |string_range|
from, to = string_range.split("..", 2)
(from =~ /^\d+$/ ? (from.to_i..to.to_i) : (from..to)).to_a
end
#=> => ["a", "b", "c", 0, 1, 2]
Comments
what about this?
a = ["a..c", "0..2"]
b = a.map { |e| Range.new( *(e).split('..') ).to_a }.flatten
no flat_map used so it works the same on all versions
as @steenslag correctly mentioned, this version does not convert to integers.
here is a version that does:
b = a.map do |e|
Range.new( *(e).split('..').map{ |c| c =~ /\A\d+\Z/ ? c.to_i : c } ).to_a
end.flatten
see it in action here
1 Comment
Sergey Blohin
Thanx, I have 1.8.7 version of Ruby and this example is worked!
a = ["a..c", "0..2"]
b = a.flat_map{|str| Range.new(*str.split('..')).to_a} # => ["a", "b", "c", "0", "1", "2"]
p b.map!{|v| Integer(v) rescue v} # => ["a", "b", "c", 0, 1, 2]
