From 3d6fef810ed5f23c5ab98bd6963e10f98e176065 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lajos=20M=C3=A9sz=C3=A1ros?= <m_lajos@hotmail.com>
Date: Thu, 20 May 2021 15:02:32 +0200
Subject: [PATCH] concat no longer refers to itself causing infinite call loop

---
 src/A.php | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/src/A.php b/src/A.php
index 0495ce1..25c6237 100644
--- a/src/A.php
+++ b/src/A.php
@@ -349,8 +349,20 @@ public static function pickRandom(array $data)
     }
 
     // A::concat([1, 2], 3, [4, 5]) -> [1, 2, 3, 4, 5]
-    public static function concat(...$args): array {
-        return self::unnest(self::map(fn($arg) => self::ensureArray($arg),$args));
+    public static function concat(...$args): array
+    {
+        return self::reduce(
+            function ($acc, $arg) {
+                if (self::isArray($arg) && !self::isAssoc($arg)) {
+                    $acc = array_merge($arg, $acc);
+                } else {
+                    $acc[] = $arg;
+                }
+                return $acc;
+            },
+            [],
+            $args
+        );
     }
 
     // A::zipObj(['a', 'b'], [1, 2]) -> {a:1, b:2}