Add uniq

Author: kilbiller

README.md

@@ -46,6 +46,7 @@ You can also check code coverage by running ```composer run test:coverage```.
 	- some
 	- first
 	- last
+	- uniq
 - Function composition
 	- flow
 	- compose

composer.json

@@ -43,6 +43,7 @@
 			"src/reject.php",
 			"src/reverse.php",
 			"src/some.php",
+			"src/uniq.php",
 			"src/zip.php"
 		]
 	},

composer.lock

@@ -0,0 +1,26 @@
+<?php
+
+namespace fphp;
+
+/**
+ * Return an array without duplicates
+ *
+ * @param array $collection collection
+ * @return array
+ * @author Rémy Peru <peru.remy@gmail.com>
+ */
+function uniq(...$args) {
+	$uniq = function (array $collection) {
+		$uniqArray = [];
+
+		foreach($collection as $item) {
+			if (!includes($item, $uniqArray)) {
+				$uniqArray[] = $item;
+			}
+		}
+
+		return $uniqArray;
+	};
+
+	return curryN($uniq, 1)(...$args);
+}

src/uniq.php

@@ -0,0 +1,24 @@
+<?php
+
+use function fphp\uniq;
+
+describe('uniq', function () {
+	it('should return input array without duplicates', function () {
+		$res = uniq([1, 2, 3, 3 ,4 ,5 , 'orange', 'green', 'orange']);
+
+		expect($res)->toBe([1, 2, 3, 4 ,5 , 'orange', 'green']);
+	});
+
+	it('should be curried', function () {
+		$res = uniq();
+		$res = $res([1, 2, 3, 3 ,4 ,5 , 'orange', 'green', 'orange']);
+
+		expect($res)->toBe([1, 2, 3, 4 ,5 , 'orange', 'green']);
+	});
+
+	it('should work with non contiguous arrays', function () {
+		$res = uniq([0 => 1, 4 => 2, 8 => 2]);
+
+		expect($res)->toBe([1, 2]);
+	});
+});