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A video series that walks through the Free Code Camp algorithmic challenges

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# JavaScript Video Series
In this video series, [Stephen Mayeux](http://stephenmayeux.com) walks through the algorithmic challenges at [Free Code Camp](http://freecodecamp.com).

## Viewing Tips

1. YouTube automatically plays videos at 480p, but it is recommended to play these videos at 720p High Definition and full screen.

2. These videos will be very practical because they will walk through the algorithmic challenges at Free Code Camp. As such, they will contain solutions to the challenges. If you want to solve the solution yourself, don't watch this video! When you have finally solved the challenge OR if you get stuck, come back and watch the video.

3. Do not be a passive learner. After watching each video, open up your favorite text editor and start applying what you have learned. Experiment with the syntax and be very, very curious. Read more about the syntax with the [official JavaScript documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript). Just don't watch the videos without coding.

## Content

### Basic Challenges

**Video 0 - Basics of JavaScript Functions** -- Syntax of functions. Passing 0, 1, or multiple arguments. Calling/invoking functions. The `return` statement. `undefined` values. YouTube: https://youtu.be/Zg6ESLIasic

1. **Reverse a String in JavaScript** -- Method chaining. `split`, `reverse`, and `join` methods in JavaScript. YouTube: https://youtu.be/gPAtcWuM8AM

2. **Factorialize a Number** -- `for` loops and `if`/`else` blocks. Using the `reduce` array method. Functional programming. Recursive programming. YouTube: https://youtu.be/43XF7GBY05E

3. **Checking for Palindromes** -- Recursive programming. `slice` and `replace` methods. Regular Expressions. YouTube: https://youtu.be/mQ6ZB24DInc

4. **Finding Longest Word in a Sentence** -- `for` loops. Functional programming with `forEach()`. Using `split(' ')` as opposed to `split('')`. YouTube: https://youtu.be/U5-jiTDgmR8

5. **Title Case a Sentence** -- Using the `map()` method to return a new array. YouTube: https://youtu.be/fsvBwqOrkKs

6. **Return Largest Numbers in an Array** -- Using `push()` to add numbers to the end of an array. Using `sort()` to sort an array of Strings and Integers. YouTube: https://youtu.be/YD4M77uB3lo

7. **Confirm the Ending** -- Using `Math.abs()` and `-Math.abs()` to generate absolute numbers. Using `.slice()` and its alternative `.substr()`. YouTube: https://youtu.be/AsLtWDncqeQ

8. **Repeat a string repeat a string** -- Using the `.repeat()` method (surprise!) to repeat strings. `Ternary operators` for simplified `if/else` blocks. YouTube: https://youtu.be/stGujQgT9EM

9. **Truncated String** -- Nothing new here! Just a simple `.slice()` method with an `if`/`else if`/`else` block. YouTube: https://youtu.be/pnUjKTgMhe8

10. **Chunky Monkey** -- Iterating through arrays using `while` loops. Shortening `counter = counter + size` to `counter += size`. YouTube: https://youtu.be/4MR5N0_KINM

11. **Slasher Flick** -- Removing items from the beginning of an array with `shift()`. Inserting and/or removing items from an array with `splice()`. YouTube: https://youtu.be/OhOOyVrERkI

12. **Mutations** -- Checking whether or not a character exists in a string using `indexOf()`. YouTube:
https://youtu.be/cz6JbsG4A-Y

13. **Falsy Bouncer** -- Boolean objects and the `filter()` array method. YouTube: https://youtu.be/6a0Owm4PUA0

14. **Seek and Destroy** -- Arguments object and converting it into an array using `Array.prototype.slice.call(arguments, 1)`. Checking whether or not an array includes a value with `includes()`. YouTube: https://youtu.be/jm7s-tZ508Y

15. **Where Do I Belong** -- Joining two arrays with `concat()` and how it differs from `push()`. YouTube: https://youtu.be/t4ETMI5m26g

16. **Ceasers Cipher** -- Encoding and decoding strings with `fromCharCode()` and `charCodeAt()`. YouTube: https://youtu.be/37yPWD-g-Ik

### Intermediate

**Watch the Intermediate Prep Video!!!** -- YouTube: https://youtu.be/SqZJr2pSr-0

1. **Sum of Numbers in a Range** -- Using `Math.min()` and `Math.max()` to add up the numbers within a range. YouTube: https://youtu.be/dlwEs4xcloY

2. **Diff of Two Arrays** -- Finding the symmetric difference or the difference between two arrays. This function uses our good friends `filter()`, `concat()`, `slice()`, and `indexOf()`. YouTube: https://youtu.be/ylbjD5fHytI

3. **Roman Numeral Converter** -- Object literals. Iterating through objects using `for...in` loops. The difference between `Math.round()` and `Math.trunc()`. Our good old friend `String.repeat()`. YouTube: https://youtu.be/OHIeCYZWVuQ

4. **Where Art Thou** -- Object literals. Creating an array of object keys with `Object.keys()` and testing whether or not every item of an array passes a test with `every()`. YouTube: https://youtu.be/zFYkDRnKdLw

5. **Search and Replace** -- If you've been following along, this challenge is nothing you couldn't do on your own! Very simple, but I introduce the `.charAt()` method. YouTube: https://youtu.be/4Zx0OFWVj-w

6. **Pig Latin** -- Converting an English word into Pig Latin. YouTube: https://youtu.be/Rg-0XRgsFlI

7. **DNA Pairings** -- Creating a 2d array of paired DNA elements. YouTube: https://youtu.be/TlksPje9A5Y

8. **Missing Letter** -- Finding the missing letter in a range of letters. YouTube: https://youtu.be/ZdU3v0irI24

9. **Boo Who** -- Boolean primitives and the `typeof` keyword. YouTube: https://youtu.be/QCFSd-JpZgg

10. **Sorted Union** -- Arguments object. Functions as first-class objects in JavaScript. Using `reduce`, `concat`, and `filter` all in one! YouTube: https://youtu.be/73IeA87eXUk

11. **Convert HTML Entities** -- Escaping characters. Replacing characters in a string with values from an object literal. YouTube: https://youtu.be/p0SN049ikj8

12. **Spinal Tap Case** -- Converting strings to spinal-case-with-regex. Capturing groups in Regex and our old friend the `replace()` method. YouTube: https://youtu.be/o66bwArtShw

13. **Sum of All Odd Fibonacci Numbers** -- Adding new methods to arrays via prototypal inheritance. The `this` keyword. YouTube: https://youtu.be/6gsOXQWDGwo

14. **Sum All Primes** -- Function hoisting. Writing modular code by breaking out logic into separate functions. YouTube: https://youtu.be/7-Z7lcm999o

15. **Smallest Common Multiple** -- Finding the smallest common multiple for a range of numbers using Euclid's alrogithm. YouTube: https://youtu.be/itPtMtdEPis

16. **Finders Keepers** -- Using function expressions with the `filter()` method. YouTube: https://youtu.be/0JrZju2q2bs

17. **Drop It** -- Using `while` to loop through something an unknown number of times. Using `shift()` to remove the first element of an array. YouTube: https://youtu.be/T3Q5Pffp6EM

18. **Steamroller** -- Flatten a nested array using `reduce()` and recursion. 2 solutions available! YouTube: https://youtu.be/0Ke8KQSOFms

19. **Binary Agents** -- Convert a string of binary code into human readable text with `parseInt()` and `fromCharCode()`. YouTube: https://youtu.be/ghLTDAvLs_w

20. **Everything Be True** -- Checking whether or not all objects in a collection have a certain property with `every()`. YouTube: https://youtu.be/UuRsIAjTKzI

21. **Arguments Optional** -- Returning functions and preserving values with closures. YouTube: https://youtu.be/wA45ErxhRao

### Advanced

**Watch the Advanced Prep Video!!** -- YouTube: https://youtu.be/dv6pkLYmqY0

1. **Validate US Phone Numbers** -- Very seriously long and complex `Regular Expressions`. Using `Regex.test()` to validate strings against a regular expression. YouTube: https://youtu.be/JB71tFPsm2s

2. **Symmetric Difference** -- Finding the symmetric difference of 2 or more sets of numbers. Uses `reduce()` and 2 helper functions. YouTube: https://youtu.be/v04Bmbfa4Jk

3. **Exact Change** -- Good, old-fashioned problem solving with the methods you already know and love. YouTube: https://youtu.be/_nAUQYOjIek

4. **Inventory Update** -- Updating the current inventory (a 2D array) with the newest inventory (another 2D array). YouTube: https://youtu.be/5FoMIM5IChw

5. **No Repeats Please** -- Calculate the number of permutations of a string with non-repeating values. YouTube: https://youtu.be/B5lUyJDkWzE

6. **Friendly Date Ranges** -- Using `Date.parse()` and the `Date` object to create friendly date ranges. YouTube: https://youtu.be/Q1qlJkPb9Nk

7. **Make A Person** -- Object constructors and the `this` keyword. Difference between public and private properties. Configuring object properties with `Object.defineProperty()`. YouTube: https://youtu.be/vhqkRKkeyVo

8. **Map the Debris** -- Doing astronomical calculations using `forEach()` and `reduce()`. YouTube: https://youtu.be/DQxLcQKVkP4

9. **Pairwise** -- The final challenge (unless Free Code Camp adds more)! Using additional arguments with `reduce()`, `NaN`, and multiple variable assignments. YouTube: https://youtu.be/yu6C1YLIdQA

## Contribute

Contributions is what makes open source projects succeed! If you see a mistake or think you have a useful improvement, fork/clone this repo and make a pull request!

If you contribute a video lesson to this series, then you are amazing! Just follow these steps:

1. Upload your video to YouTube.
2. Submit one JavaScript file for each lesson.
3. Update the README and add your lesson under the Content section.
4. Make a pull request and await everlasting glory.

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