Core Language
The Qi core language is a simplification of the Lisp language. Functions are written in prefix form. Symbols, variables, booleans, numbers, strings and characters are all self-evaluating if typed at the top level. Here are some examples.
Here is the traditional Hello world program in Qi:
(output "Hello, world~%")Lists are constructed with with spaces separating the elements of the list.
A factorial function using pattern matching:
(define factorial 0 -> 1 N -> (* N (factorial (- N 1))))A lambda function in Qi that multiplies its input by 2.
(/. X (* X 2))The membership function using pattern-matching over lists. (Qi largely follows the Edinburgh syntax convention for matching (i.e. variables are headed in uppercase), except that spaces are used instead of commas to separate items.)
(define member _ -> false X -> true X -> (member X Y))A function using guards that finds the first number greater than N in a list.
(define find_greater N -> (error "no number greater than ~A.~%" N) N -> M where (> M N) N -> (find_greater N Ns))Read more about this topic: Qi (programming Language)
Famous quotes containing the words core and/or language:
“In the core of God’s abysm,—
Was a weed of self and schism;
And ever the Daemonic Love
Is the ancestor of wars,
And the parent of remorse.”
—Ralph Waldo Emerson (1803–1882)
“As in private life one differentiates between what a man thinks and says of himself and what he really is and does, so in historical struggles one must still more distinguish the language and the imaginary aspirations of parties from their real organism and their real interests, their conception of themselves from their reality.”
—Karl Marx (1818–1883)