Unless

unless

1 Perl

$a = 0;
unless ($a) {
    printf("false\n");
} else {
    printf("true\n");
}

• one-line

print 'hello' unless 1;
print 'world' unless 0;
# world

2 Ruby

a = false
unless a
    puts "false"
else
    puts "true"
end

• one-line

print 'hello' unless true
print 'world' unless false
# world

3 같이 보기

• if