Python String Interviews
From string fundamentals to Unicode, parsers, tries, and dynamic programming.
Before you start: Python variables, loops, functions, lists and dictionaries.
Explore course →Choose a path for your goal
New to programming? Start with a Foundations course. Already know the basics? Choose a focused course and browser practice.
These are suggested sequences, not enforced prerequisites. Start with any course whose prerequisites match your skills.
Automate and analyze data
SQL is also an independent starting point; you do not need to finish Python first.
Suggested sequence
- Python Foundations — optional beginner start
Before you start: No prior programming experience required.
- Debugging and Testing Code — Python
Before you start: Python functions, loops, lists and dictionaries.
- Practical Python: Text and Data Automation
Before you start: Python variables, loops, functions, lists and dictionaries.
- SQL for Real-World Data
Before you start: Read a small table and follow basic programming examples; no prior SQL required.
Write more reliable JavaScript
Start with foundations or build on your existing JavaScript skills.
Suggested sequence
- JavaScript Foundations — optional beginner start
Before you start: No prior programming experience required.
- Debugging and Testing Code — JavaScript
Before you start: JavaScript functions, loops, arrays and objects.
- TypeScript for JavaScript Developers
Before you start: JavaScript functions, loops, arrays and objects.
Prepare for coding interviews
Choose a language. Parallel tracks cover corresponding concepts with independent code and progress.
Python
- Python Foundations — optional beginner start
Before you start: No prior programming experience required.
- Python String Interviews
Before you start: Python variables, loops, functions, lists and dictionaries.
- Data Structures and Algorithms — Python
Before you start: Python functions, loops, lists and dictionaries.
JavaScript
- JavaScript Foundations — optional beginner start
Before you start: No prior programming experience required.
- JavaScript String Interviews
Before you start: JavaScript functions, loops, arrays and objects.
- Data Structures and Algorithms — JavaScript
Before you start: JavaScript functions, loops, arrays and objects.
All courses
JavaScript String Interviews
Understand JavaScript strings, build reliable solutions, and explain the tradeoffs.
Before you start: JavaScript functions, loops, arrays and objects.
Explore course →Practical Python: Text and Data Automation
Clean CSV and JSON, validate records, summarize logs, and build repeatable reports.
Before you start: Python variables, loops, functions, lists and dictionaries.
Explore course →SQL for Real-World Data
Query synthetic data with SQLite: joins, grouped reports, CTEs, windows, and useful data-quality checks.
Before you start: Read a small table and follow basic programming examples; no prior SQL required.
Explore course →TypeScript for JavaScript Developers
Build on JavaScript with strict types, narrowing, generics, validated external data, and deterministic typed pipelines.
Before you start: JavaScript functions, loops, arrays and objects.
Explore course →Data Structures and Algorithms — Python
Arrays, maps, trees, graphs, greedy methods, backtracking, and dynamic programming. Parallel language tracks cover corresponding concepts with independent code and progress.
Before you start: Python functions, loops, lists and dictionaries.
Explore course →Data Structures and Algorithms — JavaScript
Arrays, maps, trees, graphs, greedy methods, backtracking, and dynamic programming. Parallel language tracks cover corresponding concepts with independent code and progress.
Before you start: JavaScript functions, loops, arrays and objects.
Explore course →Debugging and Testing Code — Python
Diagnose errors, isolate reproductions, repair boundary and mutation bugs, design regression tests, and review flawed generated code. Parallel tracks teach corresponding concepts with independent progress.
Before you start: Python functions, loops, lists and dictionaries.
Explore course →Debugging and Testing Code — JavaScript
Diagnose errors, isolate reproductions, repair boundary and mutation bugs, design regression tests, and review flawed generated code. Parallel tracks teach corresponding concepts with independent progress.
Before you start: JavaScript functions, loops, arrays and objects.
Explore course →Python Foundations
Start programming with values, variables, conditions, functions and collections. Build small programs with guided practice and two projects.
Before you start: No prior programming experience required.
Explore course →JavaScript Foundations
Start programming with values, variables, conditions, functions and collections. Build small programs with guided practice and two projects.
Before you start: No prior programming experience required.
Explore course →