Mojo Miji - A Guide to Mojo Programming Language from A Pythonista's Perspective

by Yuhao Zhu 朱宇浩

Notes

This Miji is compatible with Mojo v0.25.6 (2025-09-22).

For the example programs featured in this Miji, you can find them in the GitHub repository.

• INTRODUCTION
• PART I: START WITH MOJO
  • Install pixi and extension (Package manager and VS Code extension)
  • Initiate Mojo project (Install Mojo compiler)
  • My first Mojo program (Hello, world!)
• PART II: MOVE INTO MOJO
  • Convert Python code into Mojo (Four examples, Python becomes Mojo)
  • Things that are in common (Similarities between Python and Mojo)
  • Things that are different (Differences between Python and Mojo)
• PART III: BASIC MOJO
  • Variables
  • Copy and move
  • Data types - basic (Int, float, bool, etc.)
  • Data types - composite (List et al.)
  • Data type - string (similar to str in Python)
  • Literals and type inference
  • Functions
  • Operators and assignment expressions
  • Control flows (Loops and conditionals)
  • Error handling and raises (Exceptions)
  • Structs (Similar to classes in Python)
  • Modules and packages (Modular programming)
• PART IV: ADVANCED MOJO
  • Data type - SIMD (The first-class SIMD type)
  • Parameterization
  • Generic and traits
  • Ownership (The ownership system)
  • References and pointers (The borrowing system)
  • Lifetimes and origins (The lifetime system)
• PART V: APPLY MOJO (Let's use Mojo to program something useful)
  • Design of MatMojo library (Preparation for a matrix library)
  • Make it work (Define and implement the basic functionalities)
• PART VI: EXTEND MOJO
  • Arbitrary-precision numbers (A library for arbitrary-precision integers and decimals)
  • Multi-dimensional arrays (A library for numerical computing and NDArray)
• PART VII: MISCELLANEOUS
  • Glossary of Mojo terms (Find explanations of key terms and concepts)
  • Tips and warnings (Do not fall into the pits I fell into)
  • Useful resources and links (Online resources and links related to Mojo)
  • About the author (A brief introduction of the author)