From 24c964a7c7f0bf2c73a56e7b023afcb46eefd359 Mon Sep 17 00:00:00 2001
From: Melvin Philips <melvin0008@gmail.com>
Date: Thu, 5 Oct 2017 00:18:25 -0700
Subject: [PATCH] Add is.infinite()

---
 index.js  |  2 ++
 readme.md |  4 ++++
 test.js   | 12 ++++++++++--
 3 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/index.js b/index.js
index 6ee2179..b3d52b9 100644
--- a/index.js
+++ b/index.js
@@ -161,4 +161,6 @@ is.inRange = (x, range) => {
 	throw new TypeError(`Invalid range: ${util.inspect(range)}`);
 };
 
+is.infinite = x => x === Infinity || x === -Infinity;
+
 module.exports = is;
diff --git a/readme.md b/readme.md
index be284c4..fab01c1 100644
--- a/readme.md
+++ b/readme.md
@@ -145,6 +145,10 @@ Check if `value` (number) is in the range of `0` to `upperBound`.
 is.inRange(3, 10);
 ```
 
+##### .infinite(value)
+
+Check if `value` is `Infinity` or `-Infinity`.
+
 
 ## FAQ
 
diff --git a/test.js b/test.js
index 7fac42f..a2c4337 100644
--- a/test.js
+++ b/test.js
@@ -89,7 +89,11 @@ const types = new Map([
 		Object.create(null),
 		new Object() // eslint-disable-line no-new-object
 	]],
-	['integer', 6]
+	['integer', 6],
+	['infinite', [
+		Infinity,
+		-Infinity
+	]]
 ]);
 
 // This ensures a certain method matches only the types
@@ -132,7 +136,7 @@ test('is.string', t => {
 });
 
 test('is.number', t => {
-	testType(t, 'number', ['nan', 'integer']);
+	testType(t, 'number', ['nan', 'integer', 'infinite']);
 });
 
 test('is.boolean', t => {
@@ -365,3 +369,7 @@ test('is.inRange', t => {
 		m.inRange(0, [1, 2, 3]);
 	});
 });
+
+test('is.infinite', t => {
+	testType(t, 'infinite', ['number']);
+});