Example for unmaintainable-code-5 https://medium.com/@akaita/30-rules-to-make-your-code-unmaintainable-7e5dbafd5bce

unmaintainable-code-5.java

for(j=0; j<array_len; j+ =8) {
  total += array[j+0 ];
  total += array[j+1 ];
  total += array[j+2 ]; /* Main body of
  total += array[j+3 ]; * loop is unrolled
  total += array[j+4 ]; * for greater speed.
  total += array[j+5 ]; */
  total += array[j+6 ];
  total += array[j+7 ];
}