From 5dbb752c9187518933198223e4b7defc9dd75343 Mon Sep 17 00:00:00 2001
From: Bobby Lat <bobby.lat@makerx.com.au>
Date: Thu, 12 Dec 2024 18:37:49 +0800
Subject: [PATCH] feat: implement arc4.methodSelector function

---
 packages/algo-ts/src/arc4/index.ts | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/packages/algo-ts/src/arc4/index.ts b/packages/algo-ts/src/arc4/index.ts
index ca63b31f..274dcff5 100644
--- a/packages/algo-ts/src/arc4/index.ts
+++ b/packages/algo-ts/src/arc4/index.ts
@@ -1,7 +1,8 @@
+import { op } from '..'
 import { BaseContract } from '../base-contract'
 import { ctxMgr } from '../execution-context'
-import { NoImplementation } from '../impl/errors'
-import { bytes, Uint64 } from '../primitives'
+import { encodingUtil } from '../internal'
+import { Bytes, bytes, Uint64 } from '../primitives'
 import { DeliberateAny } from '../typescript-helpers'
 
 export * from './encoded-types'
@@ -91,5 +92,5 @@ export function baremethod<TContract extends Contract>(config?: BareMethodConfig
  * @returns The ARC4 method selector. Eg. `02BECE11`
  */
 export function methodSelector(methodSignature: string): bytes {
-  throw new NoImplementation()
+  return op.sha512_256(Bytes(encodingUtil.utf8ToUint8Array(methodSignature))).slice(0, 4)
 }