From 2e68f8ae86fe0eb9a87165ec3a581f338d104341 Mon Sep 17 00:00:00 2001
From: Angelos Chalaris <chalarangelo@gmail.com>
Date: Thu, 7 Dec 2017 02:25:29 +0200
Subject: [PATCH] Number validation

---
 README.md                   | 10 ++++++++++
 snippets/validate-number.md |  8 ++++++++
 2 files changed, 18 insertions(+)
 create mode 100644 snippets/validate-number.md

diff --git a/README.md b/README.md
index f221eebb5..4ea0c21b6 100644
--- a/README.md
+++ b/README.md
@@ -26,6 +26,7 @@
 * [Unique values of array](#unique-values-of-array)
 * [URL parameters](#url-parameters)
 * [UUID generator](#uuid-generator)
+* [Validate number](#validate-number)
 
 ### Anagrams of string (with duplicates)
 
@@ -209,6 +210,15 @@ var uuid = _ =>
   )
 ```
 
+### Validate number
+
+Use `!isNaN` in combination with `parseFloat()` to check if the argument is a number.
+Use `isFinite()` to check if the number is finite.
+
+```js
+var validateNumber = n => !isNaN(parseFloat(n)) && isFinite(n);
+```
+
 ## Credits
 
 *Icons made by [Smashicons](https://www.flaticon.com/authors/smashicons) from [www.flaticon.com](https://www.flaticon.com/) is licensed by [CC 3.0 BY](http://creativecommons.org/licenses/by/3.0/).*
diff --git a/snippets/validate-number.md b/snippets/validate-number.md
new file mode 100644
index 000000000..38bfb2f58
--- /dev/null
+++ b/snippets/validate-number.md
@@ -0,0 +1,8 @@
+### Validate number
+
+Use `!isNaN` in combination with `parseFloat()` to check if the argument is a number.
+Use `isFinite()` to check if the number is finite.
+
+```js
+var validateNumber = n => !isNaN(parseFloat(n)) && isFinite(n);
+```