From 65220cc8db0d7c63f49627526466d54969958fe1 Mon Sep 17 00:00:00 2001
From: Nick Van Doorn <vandoorn.nick@gmail.com>
Date: Fri, 29 Mar 2019 00:35:56 -0700
Subject: Init commit

---
 src/use-interval.js | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 src/use-interval.js

(limited to 'src/use-interval.js')

diff --git a/src/use-interval.js b/src/use-interval.js
new file mode 100644
index 0000000..5ca3305
--- /dev/null
+++ b/src/use-interval.js
@@ -0,0 +1,29 @@
+// lifted from here:
+// https://overreacted.io/making-setinterval-declarative-with-react-hooks/
+import React, { useState, useEffect, useRef } from 'react'
+
+export const useInterval = (callback, delay) => {
+  const savedCallback = useRef()
+
+  // Remember the latest callback.
+  useEffect(
+    () => {
+      savedCallback.current = callback
+    },
+    [callback]
+  )
+
+  // Set up the interval.
+  useEffect(
+    () => {
+      function tick() {
+        savedCallback.current()
+      }
+      if (delay !== null) {
+        let id = setInterval(tick, delay)
+        return () => clearInterval(id)
+      }
+    },
+    [delay]
+  )
+}
-- 
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