Added a snippet to split an array into two arrays based on a callback function

Author: Swaraj-Singh-30

snippets/javascript/array-manipulation/partition-an-array-into-two.md

@@ -0,0 +1,19 @@
+---
+title: Partition Array
+description: Splits an array into two arrays based on a callback function.
+author: Swaraj-Singh-30
+tags: javascript,array,partition,reduce,utility
+---
+
+```js
+const partition = (arr, callback) =>
+  arr.reduce(
+    ([pass, fail], elem) => (callback(elem) ? [[...pass, elem], fail] : [pass, [...fail, elem]]),
+    [[], []]
+  );
+
+// Usage:
+const numbers = [1, 2, 3, 4, 5, 6];
+const isEven = (n) => n % 2 === 0;
+console.log(partition(numbers, isEven)); // Output: [[2, 4, 6], [1, 3, 5]]
+```