feat: 🎸 add xosrshift implementation

src/__tests__/xorshift.spec.ts

@@ -0,0 +1,12 @@
+import {xorShift32} from '../xorshift';
+
+test('generates random integers', () => {
+  const numbers: number[] = [];
+  for (let i = 0; i < 100; i++) {
+    const num = xorShift32();
+    numbers.push(num);
+    expect(Math.floor(num)).toBe(num);
+  }
+  const set = new Set(numbers);
+  expect(set.size).toBe(100);
+});

src/xorshift.ts

@@ -0,0 +1,11 @@
+export const makeXorShift32 = (seed: number = 1 + Math.round(Math.random() * ((-1>>>0)-1))) => {
+  let x = seed|0;
+  return function xorShift32() {
+    x ^= x << 13;
+    x ^= x >> 17;
+    x ^= x << 5;
+    return x;
+  };
+}
+
+export const xorShift32 = makeXorShift32();