From c6ed8a48db46db8864265c8dd91804d048639d9d Mon Sep 17 00:00:00 2001
From: Angelos Chalaris <chalarangelo@gmail.com>
Date: Sun, 11 Oct 2020 17:05:48 +0300
Subject: [PATCH] Add repeatGenerator

---
 snippets/repeatGenerator.md | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 snippets/repeatGenerator.md

diff --git a/snippets/repeatGenerator.md b/snippets/repeatGenerator.md
new file mode 100644
index 000000000..45b93a295
--- /dev/null
+++ b/snippets/repeatGenerator.md
@@ -0,0 +1,27 @@
+---
+title: repeatGenerator
+tags: function,generator,advanced
+---
+
+Creates a generator, repeating the given value indefinitely.
+
+- Use a non-terminating `while` loop, that will `yield` a value every time `Generator.prototype.next()` is called.
+- Use the return value of the `yield` statement to update the returned value if the passed value is not `undefined`.
+
+```js
+const repeatGenerator = function* (val) {
+  let v = val;
+  while (true) {
+    let newV = yield v;
+    if (newV !== undefined) v = newV;
+  }
+};
+```
+
+```js
+const repeater = repeatGenerator(5);
+repeater.next(); // { value: 5, done: false }
+repeater.next(); // { value: 5, done: false }
+repeater.next(4); // { value: 4, done: false }
+repeater.next(); // { value: 4, done: false }
+```