Creating implementation for idiom 320 : Test if string is empty

Idiom

# 320 Test if string is empty

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

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(def b (nil? s))

b = s.empty();

var b = string.IsNullOrEmpty(s);

final b = s.isEmpty;

b := s == ""

boolean b = s.equals("");

b := (s = '');

use strict;

my $b = $s eq '';

b = s == ''

b = s.empty?

b = s.is_empty()