Merge pull request #1000 from peter279k/add_is_weekend

[FEATURE] Add isWeekend code snippets

snippets/isWeekend.md

@@ -0,0 +1,16 @@
+### isWeekend
+
+Results in a boolean representation of a specific date.
+
+Pass the specific date object firstly.
+Use `Date.getDay()` to check weekend then return a boolean.
+
+```js
+const isWeekend = (t = new Date()) => {
+  return t.getDay() === 0 || t.getDay() === 6;
+};
+```
+
+```js
+isWeekend(); // 2018-10-19 (if current date is 2018-10-18)
+```

tag_database

@@ -173,6 +173,7 @@ isUndefined:type,beginner
 isUpperCase:string,utility,beginner
 isValidJSON:type,json,intermediate
 isWeekday:date,beginner
+isWeekend:date,beginner
 isWritableStream:node,type,intermediate
 join:array,intermediate
 JSONtoCSV:array,string,object,advanced

test/isWeekend.test.js

@@ -0,0 +1,16 @@
+const {isWeekend} = require('./_30s.js');
+
+test('isWeekend is a Function', () => {
+  expect(isWeekend).toBeInstanceOf(Function);
+});
+test('Returns the correct type', () => {
+  expect(typeof isWeekend()).toBe('boolean');
+});
+const friday = new Date('2019-07-19');
+const saturday = new Date('2019-07-20');
+test('Returns true', () => {
+  expect(isWeekend(friday)).toBe(false);
+});
+test('Returns false', () => {
+  expect(isWeekend(saturday)).toBe(true);
+});