A Lisp program is composed mainly of Lisp functions. This chapter explains what functions are, how they accept arguments, and how to define them.
|• What Is a Function:||Lisp functions vs. primitives; terminology.|
|• Lambda Expressions:||How functions are expressed as Lisp objects.|
|• Function Names:||A symbol can serve as the name of a function.|
|• Defining Functions:||Lisp expressions for defining functions.|
|• Calling Functions:||How to use an existing function.|
|• Mapping Functions:||Applying a function to each element of a list, etc.|
|• Anonymous Functions:||Lambda expressions are functions with no names.|
|• Generic Functions:||Polymorphism, Emacs-style.|
|• Function Cells:||Accessing or setting the function definition of a symbol.|
|• Closures:||Functions that enclose a lexical environment.|
|• Advising Functions:||Adding to the definition of a function.|
|• Obsolete Functions:||Declaring functions obsolete.|
|• Inline Functions:||Functions that the compiler will expand inline.|
|• Declare Form:||Adding additional information about a function.|
|• Declaring Functions:||Telling the compiler that a function is defined.|
|• Function Safety:||Determining whether a function is safe to call.|
|• Related Topics:||Cross-references to specific Lisp primitives that have a special bearing on how functions work.|
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