From 17fbd41f033ca7aa11f91785904220ed509de1f3 Mon Sep 17 00:00:00 2001
From: metamuffin <metamuffin@disroot.org>
Date: Mon, 29 Jan 2024 11:14:32 +0100
Subject: liftA2

---
 src/observable.ts | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'src/observable.ts')

diff --git a/src/observable.ts b/src/observable.ts
index a9e23e8..bd66963 100644
--- a/src/observable.ts
+++ b/src/observable.ts
@@ -41,6 +41,13 @@ export class OVar<T> {
         uv.weak = true
         return uv;
     }
+    liftA2<U, V>(other: OVar<U>, fn: (x: T, y: U) => V): OVar<V> {
+        const uv = new OVar(fn(this.value, other.value))
+        uv.cancel_source = this.onchange(x => uv.value = fn(x, other.value))
+        uv.cancel_source = other.onchange(y => uv.value = fn(this.value, y))
+        uv.weak = true
+        return uv;
+    }
     wait_for(val: T) {
         return new Promise<void>(r => {
             const abort = this.onchangeinit(v => {
-- 
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