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+# Hello World
+
+Deno is a secure runtime for both JavaScript and TypeScript. As the hello world
+examples below highlight the same functionality can be created in JavaScript or
+TypeScript, and Deno will execute both.
+
+## JavaScript
+
+In this JavaScript example the message `Hello [name]` is printed to the console
+and the code ensures the name provided is capitalized.
+
+**Command:** `deno run hello-world.js`
+
+```js
+function capitalize(word) {
+  return word.charAt(0).toUpperCase() + word.slice(1);
+}
+
+function hello(name) {
+  return "Hello " + capitalize(name);
+}
+
+console.log(hello("john"));
+console.log(hello("Sarah"));
+console.log(hello("kai"));
+
+/**
+ * Output:
+ *
+ * Hello John
+ * Hello Sarah
+ * Hello Kai
+**/
+```
+
+## TypeScript
+
+This TypeScript example is exactly the same as the JavaScript example above, the
+code just has the additional type information which TypeScript supports.
+
+The `deno run` command is exactly the same, it just references a `*.ts` file
+rather than a `*.js` file.
+
+**Command:** `deno run hello-world.ts`
+
+```ts
+function capitalize(word: string): string {
+  return word.charAt(0).toUpperCase() + word.slice(1);
+}
+
+function hello(name: string): string {
+  return "Hello " + capitalize(name);
+}
+
+console.log(hello("john"));
+console.log(hello("Sarah"));
+console.log(hello("kai"));
+
+/**
+ * Output:
+ *
+ * Hello John
+ * Hello Sarah
+ * Hello Kai
+**/
+```