Testable JavaScript

May 14, 2017

Introduction

As a hackerrank contest player, Julia likes to do some research on how to improve her performance. She was surprised that she could not figure out easy algorithm on Hackerrank last year, and then she posted questions on codereview.stackexchange.com, and then she quickly followed the advice. She felt more confident on easy algorithm on hackerrank contest. Here is one of questions she asked on a easy algorithm called Spiral Message.

For medium level algorithm, Julia stumbled badly on Rookie3 maximum score algorithm. She tried to look up the lead board and then tried to find out a good solution to work on her skills, and then she figured out that it is better to work on the basics. She remembered that she read a book to teach how to set up a good test case, and she likes to enhance her skills to use test case for the algorithm analysis.

The book is called "The art of readable code", chapter 14: testing and readability.

It is always a good idea to read book written by google programmers, specially short books like 200 pages.

Testable JavaScript

It is a good idea to read the book called "Testable JavaScript" again in 2017.

Choose a good fight, instead of fighting against the hackerrank contest lead board, Julia likes to follow the author, Mark Ethan Trostler, a googler by reading the book again.

The ideal case is that Julia will design the algorithm using a new school technique, by working smart on testable idea. Really focus on a small unit test case, instead of focusing on recurrence formula, analysis of the algorithm. Will try to read the book again in 2017 and see if there are some valuable ideas in the book.


Show how hard Julia tries to study the book and gather all topics she should learn again.

Book reading 

May 14, 2017 3:20 pm - 4:29 pm
Read the book from page 1 - 13, page 35 / 273, chapter one.

Chapter 2. Complexity 

Code size

Notes:

comand query separation - commands are setters and queries are getters.

internal and external names of docRoot versus realRoot


A better solution is to use private properties with public getters and setters.

Try to read JavaScript code and understand the discussion - maybe I should put the code in html page next time.
Try to complete chapter 2 reading first.

JSLint

Cyclomatic Complexity 

independent paths

jsmeter - a command-line tool


Read the article about Complexity metrics - link is here.

multiple exits -


bad fix probability

Actionable Items

Elements of JavaScript style - article link is here. Chinese translated version is here.

12 books every JavaScript developer should read - article link is here.

Read the book "The art of readable code" again. First reading is in 2014, Oct. 31, 2014.
Chapter 8: Break down giant expression - favorite example:

 Two ranges does not overlap