Какие кодотрюки вы знаете?

#if 0
(...some_temporary_removed_code...)
#endif

$x = 1 или 0
....
$x = 1 - $x;

[1, 'total', 'abc', 'zzz'].sort(function (a, b) { 
    if (a == 'total') {
        return 1
    }; 
    if (b == 'total') {
        return -1
    }; 
    if (a < b) {
        return -1
    } 
    else if (a > b) {
        return 1
    }; 
    return 0
});

var x = null;
var t = x || 5;
t;

def func(a, b):
    print a or b

func(None, 'q')
func(123, 10)
func([1,2,3],'')
func('', {1: 5})

q
123
[1, 2, 3]
{1: 5}

obj ||= {}

strcpy(to, from, count)
register char *to, *from;
register count;
{
    register n = (count + 7) / 8;
    if (!count) return;
    switch (count % 8) {
    case 0: do { *to = *from++;
    case 7:      *to = *from++;
    case 6:      *to = *from++;
    case 5:      *to = *from++;
    case 4:      *to = *from++;
    case 3:      *to = *from++;
    case 2:      *to = *from++;
    case 1:      *to = *from++;
               } while (--n > 0);
    }
}

$a = 5;
$b = 7;
$a = $a + $b; // 12
$b = $a - $b; // 5
$a = $a - $b; // 7

/* 
   USAGE: 
   int64_t m = supermax(1, 234234, 35423523, 777); // m = 35423523
*/

#include "stdint.h"
#include "limits.h"

#define NUM_OF_ARGS(...) (sizeof((int64_t[]){__VA_ARGS__})/sizeof(int64_t))

#define supermax(...) _supermax((int64_t[]){__VA_ARGS__}, NUM_OF_ARGS(__VA_ARGS__))
int64_t _supermax(int64_t arr[], int size)
{
    int64_t max = arr[0];

    int i = 0;
    while (i < size) {
        if (arr[i] > max)
            max = arr[i];
        i++;
    }
    return max;
}


#include "stdio.h"

int main()
{
    int64_t x = supermax(1,2,3,4,5);
    printf("%lld\n", x);
}