Added A::findIndex, O::keys and O::values

README.md

@@ -24,6 +24,8 @@ Every method is abide to the following rules ( or at least they should. if they
 - **null return values on error** - when an error happens and the underlying php function returns false (eg. end or strpos), then it's being normalized to null
 - **camelCase naming**
 
+Plain numeric arrays are handled best via the methods in A, while associative arrays and objects are handled via the methods in O.
+
 ## API
 
 ### Array
@@ -99,8 +101,79 @@ Every method is abide to the following rules ( or at least they should. if they
 - **head** -
 - **first** -
 - **filter** -
-- **find** -
-- **any** -
+
+- **find** - calls the given function on the elements of an array and returns the value for the first match. if there's no match, it will return `null`
+
+  ```php
+  $data = [
+    ["a" => 8],
+    ["a" => 10],
+    ["a" => 12]
+  ];
+
+  $result = A::find(function($x) {
+    return $x["a"] === 10;
+  }, $data);
+
+  // $result = ["a" => 10]
+  ```
+
+  ```php
+  $data = [
+    ["a" => 8],
+    ["a" => 10],
+    ["a" => 12]
+  ];
+
+  $result = A::find(function($x) {
+    return $x["a"] === -4;
+  }, $data);
+
+  // $result = null
+  ```
+
+- **findIndex** - calls the given function on the elements of an array and returns the key for the first match. if there's no match it will return -1
+
+  ```php
+  $data = [
+    ["a" => 8],
+    ["a" => 10],
+    ["a" => 12]
+  ];
+
+  $result = A::findIndex(function($x) {
+    return $x["a"] === 10;
+  }, $data);
+
+  // $result = 1
+  ```
+
+  ```php
+  $data = [
+    ["a" => 8],
+    ["a" => 10],
+    ["a" => 12]
+  ];
+
+  $result = A::findIndex(function($x) {
+    return $x["a"] === -4;
+  }, $data);
+
+  // $result = -1
+  ```
+
+- **any** - calls the given predicate function on the elements in the given array and returns true if for at least one of them the predicate returns true
+
+  ```php
+  $data = [2, 3, 5, 6, 7, 9, 10];
+
+  $result = A::any(function($x) {
+    return $x % 5 === 0;
+  }, $data);
+
+  // $result = true
+  ```
+
 - **includes** -
 - **slice** -
 - **join** -
@@ -230,6 +303,9 @@ Every method is abide to the following rules ( or at least they should. if they
   O::has('y', $data); // false
   ```
 
+- **keys** -
+- **values** -
+
 ## Future plans
 
 I keep adding methods as I come across the need for them, so if you're missing a method you'd use, then 1) PRs are welcome, 2) Issues are welcome.

src/A.php

@@ -266,7 +266,22 @@ public static function find(callable $fn, array $data)
         return self::first($results);
     }
 
-    // A::find(x => x.a === 10, [['a' => 8], ['a' => 10]]) -> true
+    // A::findIndex(x => x.a === 10, [['a' => 8], ['a' => 10]]) -> 1
+    public static function findIndex(callable $fn, array $data): int {
+        if (self::isEmpty($data)) {
+            return -1;
+        }
+
+        foreach ($data as $key => $value) {
+            if ($fn($value)) {
+                return $key;
+            }
+        }
+
+        return -1;
+    }
+
+    // A::any(x => x.a === 10, [['a' => 8], ['a' => 10]]) -> true
     public static function any(callable $fn, array $data): bool
     {
         return self::find($fn, $data) !== null;

src/O.php

@@ -60,4 +60,24 @@ public static function dissoc(string $key, object $data): object {
     public static function has(string $key, $data): bool {
         return array_key_exists($key, $data);
     }
+
+    public static function keys($data): array {
+        if (self::isObject($data)) {
+            return A::keys(get_object_vars($data));
+        }
+        if (A::isArray($data) && A::isAssoc($data)) {
+            return A::keys($data);
+        }
+        return [];
+    }
+
+    public static function values($data): array {
+        if (self::isObject($data)) {
+            return A::values(get_object_vars($data));
+        }
+        if (A::isArray($data) && A::isAssoc($data)) {
+            return A::values($data);
+        }
+        return [];
+    }
 }