add example demonstrating Deno collections for user data processing

examples/data-processing.ts

@@ -0,0 +1,49 @@
+/**
+ * @title User Data Processing with Deno Collections
+ * @difficulty intermediate
+ * @tags cli, deploy
+ * @group Data Processing
+ * @run --allow-read data-processing.ts
+ *
+ * Demonstrates using Deno's @std/collections library for processing user data.
+ * This example uses pick, omit, and partition to manipulate data structures.
+ */
+
+import { omit, partition, pick } from "jsr:@std/collections";
+
+// Define the User type with fields for id, name, role, age, and country
+type User = {
+  id: number;
+  name: string;
+  role: string;
+  age: number;
+  country: string;
+};
+
+// Sample array of user data for demonstration purposes
+const users: User[] = [
+  { id: 1, name: "Alice", role: "admin", age: 30, country: "USA" },
+  { id: 2, name: "Bob", role: "user", age: 25, country: "Canada" },
+  { id: 3, name: "Charlie", role: "user", age: 28, country: "USA" },
+  { id: 4, name: "Dave", role: "admin", age: 35, country: "Canada" },
+  { id: 5, name: "Eve", role: "user", age: 22, country: "UK" },
+];
+
+// 1. Pick specific fields from each user for selective data extraction
+// Using pick to include only id, name, and country for each user in the new array
+const pickedUsers = users.map((user) => pick(user, ["id", "name", "country"]));
+console.log("Picked user data:", pickedUsers);
+
+// 2. Omit specific fields from each user to remove sensitive data
+// Using omit to exclude the "id" field from each user object in the new array
+const omitUsers = users.map((user) => omit(user, ["id"]));
+console.log("Omitted user data:", omitUsers);
+
+// 3. Partition users based on role to categorize them into admins and regular users
+// Using partition to split users array into two groups: admins and regular users
+const [admins, regularUsers] = partition(
+  users,
+  (user) => user.role === "admin", // Condition to check if user role is admin
+);
+console.log("Admins:", admins);
+console.log("Regular Users:", regularUsers);