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Module 1: Foundations
4 lessons•~20 mins
Programs, variables, types, expressions, and I/O.
Coding Basics
Start programming with practical, bite-size lessons and patterns you can apply anywhere.
Progress
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Modules
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Module 2: Control Flow
4 lessons•~20 mins
Conditionals, loops, and iteration patterns.
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Module 3: Functions & Scope
4 lessons•~20 mins
Defining functions, parameters, scope, and recursion.
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Module 4: Data Structures
4 lessons•~20 mins
Arrays/lists, objects/maps, sets, and strings.
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Module 5: Algorithms & Testing
4 lessons•~20 mins
Decomposition, complexity, classic algorithms, and tests.
All Lessons (20)
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What Is a Program?
A set of instructions that a computer executes.
Variables and Types
Names bound to values with defined operations.
Expressions and Operators
Build values from other values using operators.
Input and Output
Read values and display results cleanly.
Conditionals
Branch execution based on conditions.
Loops
Repeat work with clear exit conditions.
Iteration Patterns
Map, filter, reduce as common loop shapes.
Loop Debugging
Find and fix off-by-one and exit bugs.
Defining Functions
Bundle steps into reusable units.
Parameters and Return Values
Pass data in and get results out.
Scope and Mutability
Where names live and how values change.
Recursion Basics
Define a solution in terms of itself with a base case.
Arrays/Lists
Ordered collections for indexed access.
Objects/Maps/Dictionaries
Key-value storage for fast lookups.
Sets and Uniqueness
Store unique elements and test membership quickly.
Strings as Sequences
Work with text safely and efficiently.
Decomposition & Pseudocode
Break problems into steps and sketch solutions.
Big-O Intuition
Reason about how work grows with input size.
Search & Sort Overview
Common strategies and when to use them.
Testing Basics
Write small checks to prevent regressions.