daily-email: add 2023-09-15

Types or no types

src/content/daily-email/2023-09-15.md

@@ -0,0 +1,53 @@
+---
+title: >
+  Types or no types
+pubDate: 2023-09-15
+permalink: >
+  archive/2023/09/15/types-or-no-types
+tags:
+  - software-development
+  - types
+  - JavaScript
+  - TypeScript
+---
+
+Here are two versions of some example code I've recently been working on.
+
+One has types and uses TypeScript, the other is JavaScript and has no types.
+
+Which do you prefer and why?
+
+## TypeScript (with types)
+
+```js
+add(...numbers: number[]): number {
+  return numbers.reduce((a: number, b: number) => a + b, 0);
+}
+
+subtract(...numbers: number[]): number {
+  let total = numbers[0];
+
+  for (var i = 1, length = numbers.length; i < length; i++) {
+    total -= numbers[i];
+  }
+  return total;
+}
+```
+
+## JavaScript (no types)
+
+```js
+add(...numbers){
+  return numbers.reduce((a, b) => a + b, 0);
+}
+
+subtract(...numbers) {
+  let total = numbers[0];
+
+  for (var i = 1, length = numbers.length; i < length; i++) {
+    total -= numbers[i];
+  }
+
+  return total;
+}
+```