Add generic Map implementation (#108)

Instead of waiting for a good time to switch the `Map` implementation,
I've decided to just offer two implementations: one for Go versions
before 1.18, and one for 1.18 and onwards. This is achieved using build
tags in the source files.

This is obviously a breaking change for consumers of this library that
use Go 1.18 and onwards.

See #88

1 files changed, 1 insertions, 23 deletions

diff --git a/gomponents_test.go b/gomponents_test.go
index d8e9e07..ffde46d 100644
--- a/gomponents_test.go
+++ b/gomponents_test.go
@@ -133,7 +133,7 @@ func TestEl(t *testing.T) {
 		assert.Equal(t, `<div class="hat"><br></div>`, e)
 	})
 
-	t.Run("renders outside if node does not implement placer", func(t *testing.T) {
+	t.Run("renders outside if node does not implement nodeTypeDescriber", func(t *testing.T) {
 		e := g.El("div", outsider{})
 		assert.Equal(t, `<div>outsider</div>`, e)
 	})
@@ -248,28 +248,6 @@ func TestGroup(t *testing.T) {
 	})
 }
 
-func TestMap(t *testing.T) {
-	t.Run("maps slices to nodes", func(t *testing.T) {
-		items := []string{"hat", "partyhat", "turtlehat"}
-		lis := g.Map(len(items), func(i int) g.Node {
-			return g.El("li", g.Text(items[i]))
-		})
-
-		list := g.El("ul", lis...)
-
-		assert.Equal(t, `<ul><li>hat</li><li>partyhat</li><li>turtlehat</li></ul>`, list)
-	})
-}
-
-func ExampleMap() {
-	items := []string{"party hat", "super hat"}
-	e := g.El("ul", g.Group(g.Map(len(items), func(i int) g.Node {
-		return g.El("li", g.Text(items[i]))
-	})))
-	_ = e.Render(os.Stdout)
-	// Output: <ul><li>party hat</li><li>super hat</li></ul>
-}
-
 func TestIf(t *testing.T) {
 	t.Run("returns node if condition is true", func(t *testing.T) {
 		n := g.El("div", g.If(true, g.El("span")))