Data update

Task/Unbias-a-random-generator/JavaScript/unbias-a-random-generator.js

@@ -0,0 +1,20 @@
+const randN = N => () => Math.floor(Math.random() * N) === 0;
+
+function unbiased(f) {
+  let x, y;
+  do {
+    x = f(), y = f();
+  } while (x === y);
+  return x;
+}
+
+for (let i = 3; i <= 6; i++) {
+  const biased = randN(i);
+  let b = [], ub = [];
+  for (let j = 0; j < 10000; j++) {
+    b.push(biased());
+    ub.push(unbiased(biased));
+  }
+  const onecounts = [b, ub].map(a => a.filter(x => x).length / 100);
+  console.log(`N = ${i}: biased ${onecounts[0]}% ones, unbiased ${onecounts[1]}% ones`);
+}