enhanced-typep obsoletes all typep thin wrappers.

⚓ Overview

25 standard Common Lisp symbols are entirely dedicated to naming pure trivial typep thin wrappers. These functions, while arguably convenient, are almost pure overhead, and they represent 2.6% of standard Common Lisp symbols. Compare:

(stringp object)
;;VS
(typep object 'string)

While the latter is slightly longer, think about all the overhead that goes into implementing, defining, documenting, learning and otherwise managing all pure trivial typep wrappers, including the standard and user-defined ones.

We can use a more orthogonal approach, just by always using typep directly. However, some code would become very annoying to write:

(remove-if #'stringp '("string" symbol "other string"))
;;VS
(remove-if (lambda (o) (typep o 'string)) '("string" symbol "other string"))

This is clearly unacceptable. We could make up some trivial function that takes a type and returns a closure that calls typep on its argument and the type, but what to call it? This library simply provides an enhanced version of typep that is exactly like the original, except it can also accept a single type argument, in which case it returns the appropriate closure:

(remove-if #'stringp '("string" symbol "other string"))
;;VS
(remove-if (typep 'string) '("string" symbol "other string"))

⚓ Dictionary