Empty string: Difference between revisions

=={{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>