Intro to Ruby Programming, Part 2
A Quick Ruby Beginner's Guide — For Loops and Iterators in Ruby
Blocks, each, map, select, times and upto — why Ruby almost never needs a C-style for loop.
1K views
Read the tutorial
Video library
The whole channel, organised.
15 lessons · 117 minutes · six languages. Short and dense, built around one idea each.
Nothing matches that yet. Try a different track or search term.
All video lessons
Learn Python #1
Intro to Python
Install Python, meet the REPL, and write your first program that takes input and does something with it.
197 views
Read the tutorial
Learn Python #2
Python Basics
Strings, numbers, lists, dictionaries and functions — the toolkit every later lesson assumes you have.
191 views
Read the tutorial
Learn Python #3
Python Loops and List Comprehension
The longest lesson on the channel, and the one that pays off most: loops, enumerate, zip, and comprehensions.
381 views
Read the tutorial
Learn Python #4
Introduction to Regular Expressions in Python
Pattern matching without the fear. Search, match, groups, and the handful of symbols worth memorising.
249 views
Read the tutorial
Learn PHP #1
Hello World in PHP with XAMPP
Get a real web server running on your own machine and serve your first dynamic page.
372 views
Read the tutorial
Learn PHP #2
PHP Web Form
HTML forms, GET vs POST, and reading what the user typed on the server side.
259 views
Read the tutorial
Learn PHP #3
Building a Factorial Calculator in PHP
Functions, loops and recursion, applied to a problem small enough to hold in your head.
268 views
Read the tutorial
Learn PHP #4
Input Sanity Checks in PHP and JavaScript
Validate on the client for speed, validate on the server for safety. Why you always need both.
300 views
Read the tutorial
Learn PHP #5
How to Make a Beautiful Website with CSS
Take the working-but-ugly form from the last lesson and make it something you would show people.
255 views
Read the tutorial
Learn C# #1
Simple Calculator App in Visual C#
A full desktop GUI app: drag the buttons, wire the events, handle the maths and the edge cases.
202 views
Read the tutorial
Learn Racket #1
Racket Download and Install
DrRacket set up and running on Windows, macOS or Linux, with the language line explained.
696 views
Read the tutorial
Learn Racket #2
Introduction to Racket
Prefix notation, define, and the substitution model that makes functional code predictable.
223 views
Read the tutorial
Interview Prep
LeetCode 997 Explained (Python) — Find the Town Judge
A graph problem in disguise. Reframe it as in-degree and out-degree and it collapses to ten lines.
309 views
Read the tutorial
Interview Prep
LeetCode 349 Explained (Python) — Intersection of Two Arrays
The set-versus-nested-loop lesson that shows up in real interviews constantly.
143 views
Read the tutorial