Introduction

Purpose of the language
Key features and design goals
Brief history and development

Getting Started

Installing the language
Basic syntax and structure
Hello, Lengine!

Data Types

Numeric data types
Boolean data type
Character and strings
List and Sequence
Set and Map

Functions and Control Structures

Defining and calling functions
Conditional expressions
Loops and iteration
Tail recursion optimization

Higher-Order Functions

Functions as first-class objects
Function composition and currying
Anonymous functions and closures

Lazy Evaluation

Lazy and Force
Stream

Error Handling and Debugging

Exceptions and error handling
Testing and test-driven development

Macro

Introduction to Macro

Advanced Topics

Interoperability with other languages

Conclusion

Future development and roadmap
Additional resources and references

Functions as first-class objects