✨ Add sleep and range

Author: takker99

range.test.ts

@@ -0,0 +1,22 @@
+import { range } from "./range.ts";
+import { assertStrictEquals } from "./deps/testing.ts";
+
+Deno.test("range()", () => {
+  let count = 0;
+  for (const i of range(0, 10)) {
+    assertStrictEquals<number>(i, count++);
+  }
+  assertStrictEquals<number>(10, count);
+
+  count = 5;
+  for (const i of range(5, 12)) {
+    assertStrictEquals<number>(i, count++);
+  }
+  assertStrictEquals<number>(12, count);
+
+  count = 0;
+  for (const i of range(5, 5)) {
+    assertStrictEquals<number>(i, count++);
+  }
+  assertStrictEquals<number>(0, count);
+});

range.ts

@@ -0,0 +1,5 @@
+export function* range(start: number, end: number) {
+  for (let i = start; i < end; i++) {
+    yield i;
+  }
+}

sleep.ts

@@ -0,0 +1,6 @@
+/** ミリ秒単位で待つ
+ *
+ * @param milliseconds 待ち時間 (ミリ秒)
+ */
+export const sleep = (milliseconds: number): Promise<void> =>
+  new Promise<void>((resolve) => setTimeout(() => resolve(), milliseconds));