From b30101d07e837797d62bdddb7ae80bf33929fba2 Mon Sep 17 00:00:00 2001
From: glhrmv <gvm.gui@gmail.com>
Date: Mon, 25 Sep 2017 15:07:22 +0100
Subject: [PATCH] Add default 0 as lower bound if range is a number. Update
 tests

---
 index.js  |  8 +++++++-
 readme.md |  2 ++
 test.js   | 10 ++++++++--
 3 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/index.js b/index.js
index 330d91d..0772fa4 100644
--- a/index.js
+++ b/index.js
@@ -148,6 +148,12 @@ const typedArrayTypes = new Set([
 ]);
 is.typedArray = x => typedArrayTypes.has(getObjectType(x));
 
-is.inRange = (x, arr) => is.array(arr) && (x >= Math.min.apply(Math, arr)) && (x <= Math.max.apply(Math, arr));
+is.inRange = (x, range) => {
+	if (is.number(range)) {
+		return (x >= Math.min(0, range)) && (x <= Math.max(range, 0));
+	}
+
+	return (is.array(range)) && (x >= Math.min.apply(Math, range)) && (x <= Math.max.apply(Math, range));
+};
 
 module.exports = is;
diff --git a/readme.md b/readme.md
index d615e5e..b355b4d 100644
--- a/readme.md
+++ b/readme.md
@@ -123,6 +123,8 @@ Check to see if the value is within a given range, for example `is.inRange(3, [0
 The range supplied can be an array of any size, though this will only check for
 the minimum and maximum values in it.
 
+If `range` is a number (e.g., `is.inRange(3, 10)`), it will be treated as a range of 0 to `range`.
+
 ## FAQ
 
 ### Why yet another type checking module?
diff --git a/test.js b/test.js
index 5aa34a5..e3d8b4b 100644
--- a/test.js
+++ b/test.js
@@ -296,7 +296,13 @@ test('is.typedArray', t => {
 
 test('is.inRange', t => {
 	const x = 3;
-	const arr = [0, 5];
 
-	t.true(m.inRange(x, arr));
+	t.true(m.inRange(x, [0, 5]));
+	t.true(m.inRange(x, [5, 0]));
+	t.true(m.inRange(x, [-5, 5]));
+	t.true(m.inRange(x, [5, -5]));
+	t.false(m.inRange(x, [4, 8]));
+
+	t.true(m.inRange(x, 10));
+	t.false(m.inRange(x, 2));
 });