6.9 Procedures

• Lambda: Basic procedure creation using lambda.
• Primitive Procedures: Procedures defined in C.
• Compiled Procedures: Scheme procedures can be compiled.
• Optional Arguments: Handling keyword, optional and rest arguments.
• Case-lambda: One function, multiple arities.
• Higher-Order Functions: Function that take or return functions.
• Procedure Properties: Procedure properties and meta-information.
• Procedures with Setters: Procedures with setters.