From b7c0b0d6de7cba57c4d46a4520b6cfb9c83393d9 Mon Sep 17 00:00:00 2001
From: Rodrigo Bermudez Schettino <rodrigobermudezschettino@gmail.com>
Date: Wed, 24 Apr 2019 01:12:38 +0800
Subject: [PATCH] Add helper toPercentage

Returns strings with percentage sign appended.
---
 changelog.md |  9 ++++++++-
 index.js     | 11 +++++++++--
 readme.md    | 10 +++++++++-
 test.js      |  4 ++++
 4 files changed, 30 insertions(+), 4 deletions(-)

diff --git a/changelog.md b/changelog.md
index b2f3161..be8f40c 100644
--- a/changelog.md
+++ b/changelog.md
@@ -16,11 +16,18 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [1.1.0] - 2019-04-24
+
+### Added
+
+- Implement helper `toPercentage` to return strings with percentage sign appended.
+
 ## [1.0.0] - 2019-04-24
 
 ### Added
 
 - Calculate percentage difference between two numbers.
 
-[unreleased]: https://github.com/rodrigobdz/percentage-diff/compare/v1.0.0...HEAD
+[unreleased]: https://github.com/rodrigobdz/percentage-diff/compare/v1.1.0...HEAD
+[1.1.0]: https://github.com/rodrigobdz/percentage-diff/compare/v1.0.0...v1.1.0
 [1.0.0]: https://github.com/rodrigobdz/percentage-diff/compare/839407f777811173c2bbb62af850e3fc6ee07ebf...v1.0.0
diff --git a/index.js b/index.js
index 66a8e8b..6d1bb62 100644
--- a/index.js
+++ b/index.js
@@ -1,6 +1,10 @@
 'use strict';
 
-module.exports = (firstNr, secondNr) => {
+function toPercentage(val) {
+	return `${val}%`;
+}
+
+function percentageDiff(firstNr, secondNr) {
 	if (typeof firstNr !== 'number') {
 		throw new TypeError(`Expected a number, got ${typeof firstNr}`);
 	}
@@ -12,4 +16,7 @@ module.exports = (firstNr, secondNr) => {
 	const percentageDiff = (secondNr - firstNr) / firstNr * 100;
 
 	return Number(percentageDiff.toFixed(2));
-};
+}
+
+module.exports = percentageDiff;
+module.exports.toPercentage = toPercentage;
diff --git a/readme.md b/readme.md
index bbcbeb6..84c555d 100644
--- a/readme.md
+++ b/readme.md
@@ -14,9 +14,11 @@ $ npm install percentage-diff
 const percentageDiff = require('percentage-diff');
 
 percentageDiff(50, 75);
+//=> 50
+percentageDiff.toPercentage(50);
 //=> 50%
 percentageDiff(45,35);
-//=> -22.22%
+//=> -22.22
 ```
 
 ## API
@@ -31,6 +33,12 @@ Type: `number`
 
 Type: `number`
 
+### percentageDiff.toPercentage(value)
+
+#### value
+
+Type: `number`
+
 ## Credits
 
 * [generator-lnm](https://github.com/rodrigobdz/generator-lnm) - Awesome node module generator
diff --git a/test.js b/test.js
index 8759f7d..961697c 100644
--- a/test.js
+++ b/test.js
@@ -34,3 +34,7 @@ test('Handles zero division', t => {
 	t.is(percentageDiff(0, 0), NaN);
 	t.is(percentageDiff(0, 2), Infinity);
 });
+
+test('Format as percentage', t => {
+	t.is(percentageDiff.toPercentage(50), '50%');
+});