From 93d151b943872f2c8f14dd51ea6aca55b828fdcb Mon Sep 17 00:00:00 2001
From: Felix Roos <flix91@gmail.com>
Date: Wed, 17 Apr 2024 12:37:19 +0200
Subject: [PATCH] anonymous patterns + muting with _

---
 packages/core/repl.mjs | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/packages/core/repl.mjs b/packages/core/repl.mjs
index 3a2e6bd6a..5b7bcd71b 100644
--- a/packages/core/repl.mjs
+++ b/packages/core/repl.mjs
@@ -54,10 +54,12 @@ export function repl({
   const scheduler =
     sync && typeof SharedWorker != 'undefined' ? new NeoCyclist(schedulerOptions) : new Cyclist(schedulerOptions);
   let pPatterns = {};
+  let anonymousIndex = 0;
   let allTransform;
 
   const hush = function () {
     pPatterns = {};
+    anonymousIndex = 0;
     allTransform = undefined;
     return silence;
   };
@@ -82,6 +84,15 @@ export function repl({
   // set pattern methods that use this repl via closure
   const injectPatternMethods = () => {
     Pattern.prototype.p = function (id) {
+      if (id.startsWith('_') || id.endsWith('_')) {
+        // allows muting a pattern x with x_ or _x
+        return silence;
+      }
+      if (id === '$') {
+        // allows adding anonymous patterns with $:
+        id = `$${anonymousIndex}`;
+        anonymousIndex++;
+      }
       pPatterns[id] = this;
       return this;
     };