Codewars Katas - Level Up Plan

Why this?

I wanted to sort Codewars katas (code problems) for people learning JavaScript so they can work their way up through a list sorted by my perceived difficulty level. The difficulty level of Codewars katas can vary too much for students. Especially since new students will have a hard time knowing if a problem is difficult or easy. (This list might work partially for other languages like C++/Ruby/Python/etc.)

Let's do this

To level up your skills, do these in order. There's references in each section for you to view. Or train up your Google skills! Avoid searching for the specific problem/solution. Because, more importantly than completing these, your goal is to understand them.

Talk out loud

When you're done with a kata, try to explain your answer out-loud. Explain each line one-by-one. If you struggle to explain a line, that's a hint to keep training on that topic.

Rinse and repeat

When you're done with the list, or feel like you have hit a wall, go back. Go to the beginning and re-do all the problems. Your goal will be to work on understanding the problems without having to use your references.

Level 0:

• Hello World

• Jenny's Secret Message (Bug fix)

• Messi Goals (Variables)

• Messi Goals Function (Functions)

• Combine Strings (Strings)

• Debugging sayHello function (Strings)

• If/else syntax debug

• Friendly reminder to read the solution out-loud

• Are you Playing Banjo? (Strings)

• Multiply (function / bug fix)

• Opposite number (Math)

• Basic variable assignment (Bug fix)

• Check for Factor (Math)

• Is n divisible by x and y? (Math, Conditionals)

Suggested Reading / Reference:

• JavaScript Variables
• JavsScript Strings
• JavaScript Booleans
• JavaScript If Statements
• JavaScript Functions

Level 1:

• Return the day (Conditionals)

• Unfinished Loop (Bug fix, loops, arrays)

• You Only Need One (Loops)

• Vowel Count (Strings, loops)

• Grasshopper - Summation (Loops)

• Function syntax debugging (Functions, synax)

• Will there be enough space? (Math)

• Friendly reminder to try be able to explain each line of your code

• If you can't sleep, just count sheep!! (Loops, string concatenation)

• Grasshopper - Debug celsius converter (Bug fix, math)

• Difference of Volumes of Cuboids (Arrays, math)

• Number toString (Bug fix)

• Get Planet Name by id (Bug fix)

• Reversed String (String manipulation) (Try this with a loop instead of any methods)

• Grade Book (Functions, conditionals)

Suggested Reading / Reference:

• JavaScript Loops
• JavaScript Arrays
• JavaScript Math

Level 2:

• Is this my tail? (Bug fix)

• Mulitiplication Table (Loops)

• Sum of Positive (Arrays, Loops)

• Student's Final Grade (Comparison)

• Can you explain the answer to that last problem?

• Find the numbers which are divisible by given number (arrays, math)

• Remove First and Last Character (Sub-string)

• Abbreviate a Two Word Name (String manipulation)

• Remove Duplicate Words

Suggested Reading / Reference:

• JavaScript Useful String Methods

Level 3:

• Multiply the number (Math)

• Closest Elevator (Math)

• Array plus array (Arrays, loops)

• Squash the bugs (Bug fix)

• Is it a Palindrome? (Strings, loops?)

• Swap Values (Bug fix) (Hint: How would you write this from scratch?)

• Sum Arrays

• What is an array?

• DNA to RNA Conversion (String manipulation)

• Keep Hydrated! (Math)

• Correct the mistakes of the character recognition software (String manipulation)

• Get character from ASCII Value

• Playing with Cubes II

• Nice Array (Arrays, nested loops)

Suggested Reading / Reference:

• JavaScript Functions (More in-depth than previous link)

Level 4:

• Object syntax debug (Objects, Syntax)

• Let's Recycle! (Objects, Arrays, Loops)

• Ironman Triathlon (Objects, Math, Logic)

Suggested Reading / Reference:

• JavaScript Objects

Level 5:

• JavaScript class-like objects (Classes)

• Regular Ball Super Ball (Classes)

• Finish the Number Game (Classes, throw error)

• Two fighters, one winner. (Classes, loops)

• A Function Within a Function (Advanced functions)

• Easy mathematical callback (Callbacks)

• Chain me (Callbacks)

Suggested Reading / Reference:

• JavaScript Classes
• Callback Function

Level 6:

• Grouped by Commas (Math, String concatenation)

• Adam & Eve (Classes, subclasses)

To continue, here's some lists:

• List: Fundamentals

• List: Basic Language Features

• List: Bug Fix

TODO: More callbacks and objects