add arrayEquals to utils

Author: thetarnav

packages/utils/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@solid-primitives/utils",
-  "version": "2.1.0",
+  "version": "2.1.1",
   "description": "A bunch of reactive utility types and functions, for building primitives with Solid.js",
   "author": "Damian Tarnawski @thetarnav <gthetarnav@gmail.com>",
   "license": "MIT",

packages/utils/src/index.ts

@@ -47,6 +47,12 @@ export function isObject(value: any): value is AnyObject {
 
 export const compare = (a: any, b: any): number => (a < b ? -1 : a > b ? 1 : 0);
 
+/**
+ * Check shallow array equality
+ */
+export const arrayEquals = (a: readonly unknown[], b: readonly unknown[]): boolean =>
+  a === b || (a.length === b.length && a.every((e, i) => e === b[i]));
+
 /**
  * Returns a function that will call all functions in the order they were chained with the same arguments.
  */

packages/utils/test/index.test.ts

@@ -1,5 +1,5 @@
 import { createComputed, createRoot } from "solid-js";
-import { createStaticStore, handleDiffArray } from "../src";
+import { createStaticStore, handleDiffArray, arrayEquals } from "../src";
 import { suite } from "uvu";
 import * as assert from "uvu/assert";
 
@@ -145,3 +145,19 @@ da("calls callbacks for added and removed items", () => {
 });
 
 da.run();
+
+const ae = suite("arrayEquals");
+
+ae("arrayEquals", () => {
+  const _1: any[] = [];
+  assert.ok(arrayEquals(_1, _1));
+  assert.ok(arrayEquals(_1, []));
+  assert.ok(arrayEquals([1, 2, 3], [1, 2, 3]));
+  assert.ok(arrayEquals([1, 2, _1], [1, 2, _1]));
+
+  assert.not.ok(arrayEquals([1, 2, 3], [1, 2, 3, 4]));
+  assert.not.ok(arrayEquals([1, 2, 3], [1, 0, 3]));
+  assert.not.ok(arrayEquals([1, 2, _1], [1, 2, []]));
+});
+
+ae.run();