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, 13 insertions, 0 deletions

diff --git a/gomponents_generic.go b/gomponents_generic.go
new file mode 100644
index 0000000..6e6500b
--- /dev/null
+++ b/gomponents_generic.go
@@ -0,0 +1,13 @@
+//go:build go1.18
+// +build go1.18
+
+package gomponents
+
+// Map a slice of anything to a slice of Nodes.
+func Map[T any](ts []T, cb func(T) Node) []Node {
+	var nodes []Node
+	for _, t := range ts {
+		nodes = append(nodes, cb(t))
+	}
+	return nodes
+}