Just PHP FUN 093.

just_php_fun_093.md

Just PHP FUN 093.

• https://www.codewars.com/kata/58663693b359c4a6560001d6 Maze Runner.

Started at 22:11 03.09.2020 Thursday Sep.
Finished at 22:44 03.09.2020 Thursday Sep. (0hrs 33minutes)

maze_runner.php

<?php 
#  https://www.codewars.com/kata/58663693b359c4a6560001d6 Maze Runner.
function maze_runner($maze, $directions): string {
  $size = count($maze);
  $out = function($point) use ($size){ 
    if(0 > $point[0] || 0 > $point[1]) return true;
    if($size <= $point[0] || $size <= $point[1]) return true;
    return false;
  };
  $pos = false;
  for($i = 0; $i < $size && ! $pos; $i+=1) for($j = 0; $j < $size && ! $pos; $j+=1)
    if(2 == $maze[$i][$j]) $pos = [$i,$j];
  $act = [
    "N" => function() use (&$pos){ $pos[0] -= 1;},
    "E" => function() use (&$pos){ $pos[1] += 1;},
    "W" => function() use (&$pos){ $pos[1] -= 1;},
    "S" => function() use (&$pos){ $pos[0] += 1;},
  ];
  foreach($directions as $step){
    list($i0,$j0) = $pos;
    $old = $maze[$i0][$j0];
    $act[$step]();
    list($i,$j) = $pos;
    $curr = $maze[$i][$j];
    // echo "[$i0,$j0]=>$old $step [$i,$j]=>$curr \n";
    if(3 == $maze[$i][$j]) return "Finish";
    if(1 == $maze[$i][$j]) return "Dead";
    if($out($pos)) return "Dead";
  }
  
  return "Lost";
}