7stud -- wrote:
>
> Here's where fetch would make a difference:
>
Or in this case:
Frederick Cheung wrote:
> or do you sometimes explicitly store nil in
> the session (and want that to be distinct from
> the value not being there at all) ?) ?
h = {"red" => nil, "blue" => true, "yellow" => nil}
puts h.fetch("green", "don't carry that color")
This is where it gets tricky and you have to be a little careful:
h = {"red" => nil, "blue" => true, "yellow" => nil}
result = h.fetch("blue", "don't carry that color")
if result == "dont't cary that color"
puts "Sorry"
elsif result
puts "Available"
else
puts "Out of stock"
end
--output:--
Available
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