time for a snapshot

workshop/steps/01-vectors/vector.ts

@@ -0,0 +1,30 @@
+export type Vec = { x: number; y: number };
+
+/** Build a vector from two numbers. */
+export function vec(x: number, y: number): Vec {
+	return { x, y };
+}
+
+/** a + b  (component-wise) */
+export function add(a: Vec, b: Vec): Vec {
+	return {
+		x: a.x + b.x,
+		y: a.y + b.y,
+	};
+}
+
+/** a - b  (component-wise) */
+export function sub(a: Vec, b: Vec): Vec {
+	return {
+		x: a.x - b.x,
+		y: a.y - b.y,
+	};
+}
+
+/** a scaled by the scalar s */
+export function scale(a: Vec, s: number): Vec {
+	return {
+		x: a.x * s,
+		y: a.y * s,
+	};
+}