From eb078d56f6e33e319e39d532457c6e207fdf3485 Mon Sep 17 00:00:00 2001
From: peter279k <peter279k@gmail.com>
Date: Fri, 19 Jul 2019 17:12:09 +0800
Subject: [PATCH] Add isWeekday code snippets

---
 snippets/isWeekday.md  | 16 ++++++++++++++++
 tag_database           |  1 +
 test/isWeekday.test.js | 16 ++++++++++++++++
 3 files changed, 33 insertions(+)
 create mode 100644 snippets/isWeekday.md
 create mode 100644 test/isWeekday.test.js

diff --git a/snippets/isWeekday.md b/snippets/isWeekday.md
new file mode 100644
index 000000000..bb2d3138f
--- /dev/null
+++ b/snippets/isWeekday.md
@@ -0,0 +1,16 @@
+### isWeekday
+
+Results in a boolean representation of a specific date.
+
+Pass the specific date object firstly.
+Use `Date.getDay()` to check weekday then return a boolean.
+
+```js
+const isWeekday = (t = new Date()) => {
+  return t.getDay() >= 1 && t.getDay() <= 5;
+};
+```
+
+```js
+isWeekday(); // true (if current date is 2019-07-19)
+```
diff --git a/tag_database b/tag_database
index 6af683d23..69e323572 100644
--- a/tag_database
+++ b/tag_database
@@ -172,6 +172,7 @@ isTravisCI:node,intermediate
 isUndefined:type,beginner
 isUpperCase:string,utility,beginner
 isValidJSON:type,json,intermediate
+isWeekday:uncategorized
 isWritableStream:node,type,intermediate
 join:array,intermediate
 JSONtoCSV:array,string,object,advanced
diff --git a/test/isWeekday.test.js b/test/isWeekday.test.js
new file mode 100644
index 000000000..d63f28a65
--- /dev/null
+++ b/test/isWeekday.test.js
@@ -0,0 +1,16 @@
+const {isWeekday} = require('./_30s.js');
+
+test('isWeekDay is a Function', () => {
+  expect(isWeekday).toBeInstanceOf(Function);
+});
+test('Returns the correct type', () => {
+  expect(typeof isWeekday()).toBe('boolean');
+});
+const friday = new Date('2019-07-19');
+const saturday = new Date('2019-07-20');
+test('Returns true', () => {
+  expect(isWeekday(friday)).toBe(true);
+});
+test('Returns false', () => {
+  expect(isWeekday(saturday)).toBe(false);
+});