Implement closest and closestIndex in a type-safer(ish...) way

[SonOfLokstallBot.git] / src / common.php

diff --git a/src/common.php b/src/common.php
index 668a11b..1a29ef3 100644 (file)
--- a/src/common.php
+++ b/src/common.php
@@ -326,13 +326,19 @@ function getFilePathsForYear(int $year) {
     })(['summer', 'winter', 'spring', 'autumn']));
 }
 
-function closest($n, $list) {
-    $a = array_filter($list, function($value) use ($n) {
-        return $value <= $n;
-    });
+function closestIndex($n, array $list) {
+    //return $list[closestIndex($n, $list)];
+    $a = map(function(int $v) use ($n) : int {
+            return (int)abs($v - $n);
+        })
+        ($list);
 
-    arsort($a);
-    return array_values($a)[0];
+    asort($a);
+    return array_keys($a)[0];
+}
+
+function closest($n, array $list) : int {
+    return $list[closestIndex($n, $list)];
 }
 
 function reveal($str) {
@@ -347,7 +353,8 @@ function reveal($str) {
     $penultimateBytes = array_filter(
         (unpack('C*', $str)),
         function($key) {
-            return ($key + 1) % 4 == 0;
+            return ($key + 1) % 4 ==
+                                  0;
         },
         ARRAY_FILTER_USE_KEY
     );