axross
diff --git a/‎solutions/jewels_and_stones.ts
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+17Lines changed: 17 additions & 0 deletions b/‎solutions/jewels_and_stones.ts
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+17Lines changed: 17 additions & 0 deletions
diff --git a/‎solutions/jewels_and_stones_test.ts
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+8Lines changed: 8 additions & 0 deletions b/‎solutions/jewels_and_stones_test.ts
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+8Lines changed: 8 additions & 0 deletions
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+// 771. Jewels and Stones
+// https://leetcode.com/problems/jewels-and-stones/
+export default function numJewelsInStones(
+  jewelChars: string,
+  stoneChars: string
+) {
+  const jewels = new Set([...jewelChars]);
+  let jewelCount = 0;
+
+  for (const s of stoneChars) {
+    if (jewels.has(s)) {
+      jewelCount += 1;
+    }
+  }
+
+  return jewelCount;
+}
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+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assertStrictEq } from "https://deno.land/std/testing/asserts.ts";
+import numJewelsInStones from "./jewels_and_stones.ts";
+
+test("771. Jewels and Stones", () => {
+  assertStrictEq(numJewelsInStones("aA", "aAAbbbb"), 3);
+  assertStrictEq(numJewelsInStones("z", "ZZ"), 0);
+});