added prelude

src/Vector/Algebra/Lib/Prelude.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace Vector\Algebra\Lib;
+
+class Prelude
+{
+    public static function usingAll()
+    {
+        return [
+            'compose' => Lambda::using('compose'),
+            'map' => Functor::using('fmap'),
+            'extract' => Functor::using('extract'),
+            'bind' => Monad::using('bind')
+        ];
+    }
+}

src/Vector/Algebra/Lib/__tests__/PreludeTest.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace Vector\Algebra\Lib\__tests__;
+
+use Closure;
+use Vector\Algebra\Lib\Prelude;
+
+class PreludeTest extends \PHPUnit_Framework_TestCase
+{
+    public function testPrelude()
+    {
+        extract(Prelude::usingAll());
+
+        /** @var closure $map */
+        /** @var closure $bind */
+        /** @var closure $extract */
+        /** @var closure $compose */
+
+        $this->assertInstanceOf('closure', $map);
+        $this->assertInstanceOf('closure', $bind);
+        $this->assertInstanceOf('closure', $extract);
+        $this->assertInstanceOf('closure', $compose);
+    }
+}