ECMAScript 6, also known as ECMAScript 2015, is the latest version of the ECMAScript standard. ES6 is a significant update to the language, and the first update to the language since ES5 was standardized in 2009. Implementation of these features in major JavaScript engines is underway now. You can find more details in official document

This is a basic challenge to learn ES6 by implementing simple features!

Fix hello.js to pass test

Fix person.js to pass test

Polygon is a class which means a simple shape.
It can calculate its area size and has following subclasses

• Rectangle
• Square
• Circle

Now Square and Circle class are not implemented yet.

Complete polygon.js to pass test

Square

• Its constructor parameter is 1 number. It means a side length.

Circle

• Its constructor parameter is 1 number. It means a radius.
• The height of Circle is radius * 2.
• The width of Circle is radius * 2.

Complete promise.js to pass test

• sleep function returns Promise. Its value is specified time.
• sleep function finish asynchronously after specified time.
• if specified time is less than 0, the Promise rejected.
• You can use setTimeout in sleep function.

Caesar cipher is a simple algorithm which makes encrypted text.

Complete cipher.js to pass test

• Allowed characters are "abcdefghijklmnopqrstuvwxyz".
• If not allowed character is present in input parameter, its character is not converted and included in result string.

You MUST NOT use for statement. If you are using for test fails.

Support uppercase in your implementation.
Each characters converted to same as lowercase.

codecheck: Finish with code 9
codecheck: tests  : 16
codecheck: success: 7
codecheck: failure: 9

codecheck: Finish with code 0
codecheck: tests  : 16
codecheck: success: 16
codecheck: failure: 0

To run tests locally install codecheck by running the following command in terminal.

$ npm install codecheck -g

To run tests in web editor please click in RUN button on left side of web editor.