Use a direct map() export instead of pipe()

src/functions.php

@@ -19,9 +19,13 @@
 
 namespace Pipeline;
 
-if (!function_exists('pipe')) {
-    function pipe(...$args): Standard
-    {
-        return new Standard(...$args);
+function map(callable $func = null): Standard
+{
+    $pipeline = new Standard();
+
+    if (!$func) {
+        return $pipeline;
     }
+
+    return $pipeline->map($func);
 }

tests/Pipeline/FunctionsTest.php

@@ -21,26 +21,26 @@
 
 use PHPUnit\Framework\TestCase;
 use Pipeline\Standard;
-use function Pipeline\pipe;
+use function Pipeline\map;
 
 /**
- * @covers \Pipeline\pipe
+ * @covers \Pipeline\map
  */
 class FunctionsTest extends TestCase
 {
     public function testPipeFunction()
     {
-        $pipeline = pipe();
+        $pipeline = map();
         $this->assertInstanceOf(Standard::class, $pipeline);
+        $this->assertSame([], iterator_to_array($pipeline));
 
-        $pipeline->map(function () {
+        $pipeline = map(function () {
             yield 1;
             yield 2;
         });
 
-        $this->assertSame(3, $pipeline->reduce());
+        $this->assertInstanceOf(Standard::class, $pipeline);
 
-        $pipeline = pipe(new \ArrayIterator([1, 2]));
         $this->assertSame(3, $pipeline->reduce());
     }
 }