What is list in autolisp?

What is list in autolisp?

List Manipulation – Part 1. As you are probably well aware, LISP stands for “List Processing”. (Not “Lost in Stupid Parenthesis”) A list is a group of elements consisting of any data type and is stored as a single variable. A list can contain any number of Reals, Integers, Strings, Variables and even other Lists.

What are the differences between cons list and append?

In terms of big O notation, cons usages are generally O(1) while append is O(n) where n is the length of the list you are dealing with. While (append (list first_elem) existing_list) technically has the same big O with (cons first_elem existing_list), the latter is more concise and faster.

What is Lisp list?

Lists are single linked lists. In LISP, lists are constructed as a chain of a simple record structure named cons linked together.

Is += same as append?

In general case append will add one item to the list, while += will copy all elements of right-hand-side list into the left-hand-side list.

What are the three function required by Lisp?

Use defun to define your own functions in LISP. Defun requires you to provide three things. The first is the name of the function, the second is a list of parameters for the function, and the third is the body of the function — i.e. LISP instructions that tell the interpreter what to do when the function is called.

What is Lisp function?

LISP also allows optional, multiple, and keyword arguments. The documentation string describes the purpose of the function. It is associated with the name of the function and can be obtained using the documentation function. The body of the function may consist of any number of Lisp expressions.

Is append faster than extend?

Your test is misleading and the proper test shows that append is the fastest method. Both appends tests that you used are appending an item at a time, but the extend() are for whole list.

What’s the difference between write print Pprint Princ and prin1?

write is the general entry point to the Lisp printer. prin1 produces output suitable for input to read . princ is just like prin1 except that the output has no escape characters. princ is intended to look good to people, while output from prin1 is intended to be acceptable for the function read .

Does anyone still use LISP?

One of the old languages, LISP, has lost its fame and started its journey to death. The language is being rarely used by developers these days. LISP is a language of fully parenthesised prefix notation and is the second oldest high-level programming language, developed in 1960.