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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

var b = string.IsNullOrEmpty(s);
use strict;
my $b = $s eq '';

If $s is undefined, then it will be treated as equal to an empty string. But, an uninitialized value warning will be issued.
#include <string.h>
bool b = !strlen(s);

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