From fc4ab365375128421b95b2faff1b529818963785 Mon Sep 17 00:00:00 2001
From: Hayleigh Thompson <me@hayleigh.dev>
Date: Sat, 19 Aug 2023 22:51:13 +0100
Subject: :zap: Trade expensive 'instanceof' checks for fast duck typed ones in
 vdom diffing.

---
 lib/src/runtime.ffi.mjs | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

(limited to 'lib/src')

diff --git a/lib/src/runtime.ffi.mjs b/lib/src/runtime.ffi.mjs
index 36b6f4a..0994231 100644
--- a/lib/src/runtime.ffi.mjs
+++ b/lib/src/runtime.ffi.mjs
@@ -1,26 +1,21 @@
-import { element, namespaced, text } from "./lustre/element.mjs";
 import { List, Empty } from "./gleam.mjs";
 import { Some, None } from "../gleam_stdlib/gleam/option.mjs";
 
-const Element = element("").constructor;
-const ElementNs = namespaced("", "").constructor;
-const Text = text("").constructor;
-
 export function morph(prev, curr, parent) {
-  if (curr instanceof ElementNs)
+  if (curr[3])
     return prev?.nodeType === 1 &&
       prev.nodeName === curr[0].toUpperCase() &&
       prev.namespaceURI === curr[3]
       ? morphElement(prev, curr, curr[3], parent)
       : createElement(prev, curr, curr[3], parent);
 
-  if (curr instanceof Element) {
+  if (curr[2]) {
     return prev?.nodeType === 1 && prev.nodeName === curr[0].toUpperCase()
       ? morphElement(prev, curr, null, parent)
       : createElement(prev, curr, null, parent);
   }
 
-  if (curr instanceof Text) {
+  if (curr[0]) {
     return prev?.nodeType === 3
       ? morphText(prev, curr)
       : createText(prev, curr);
-- 
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