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Programming-Idioms

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Idiom #320 Test if string is empty

Set b to true if the string s is empty, false otherwise

b = s == ''
b = not s
b = s.empty?
let b = !!s
boolean b = s.equals("");
boolean b = s.intern() == "";

If you're comparing a String reference to a String literal, you can use the equality operator if you "intern" the reference.
#include <string.h>
bool b = !strlen(s);

C23 bool
New implementation...
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programming-idioms.org 
b = s == ''
b = not s
b = s.empty?
let b = !!s
boolean b = s.equals("");
boolean b = s.intern() == "";
bool b = !strlen(s);
(def b (nil? s))
b = s.empty();
var b = string.IsNullOrEmpty(s);
final b = s.isEmpty;
b := s == ""
b := (s = '');
my $b = $s eq '';
b = s.is_empty()