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js/vec2.js

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+const magnitude = ([x, y]) => Math.sqrt(x * x + y * y);
+
+const add = ([x1, y1], [x2, y2]) => [x1 + x2, y1 + y2];
+
+const subtract = ([x1, y1], [x2, y2]) => [x1 - x2, y1 - y2];
+
+const limit = ([x, y], maxMagnitude) => {
+    const m = magnitude([x, y]);
+    if (m <= maxMagnitude) return [x, y];
+
+    const scalingFactor = maxMagnitude / m;
+    return [x * scalingFactor, y * scalingFactor];
+};