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Empty string: Difference between revisions
add Ruby
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Line 318:
if s:
print('String s is not empty.')</lang>
=={{header|Ruby}}==
Create an empty string
<lang ruby>s = ""
s = String.new
s = "any string".clear</lang>
These expressions all evaluate to true to determine emptiness:
<lang ruby>s == ""
s.eql?("")
s.empty?
s.length == 0
s[/^$/]
# also silly things like
s.each_char.to_a.empty?</lang>
Non-empty expressions:
<lang ruby>s != ""
s.length > 0
s[/./]</lang>
Note that we cannot do the following, because the empty string is equivalent to true in Ruby ([[Boolean values#Ruby]]):
<lang ruby>if s then puts "not empty" end</lang>
=={{header|Seed7}}==
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