Writing and displaying values to ports
(scheme write) writes Scheme values to output ports. display produces human-readable output (no string quotes), write produces machine-readable output (re-readable, with quotes and escapes), and newline emits a line break.
(import (scheme base) (scheme write))
(display "hi\n") ;; prints: hi
(write "hi") ;; prints: "hi" (with quotes)
(write '(1 "two" #\c)) ;; prints: (1 "two" #\c)
(newline)write-shared and write-simple control how shared/cyclic structure is printed (with or without datum labels).
5 bindings
Syntax: (display obj) (display obj port) Library: (scheme write) Description: Writes a human-readable representation of obj to the current output port or the given port. Strings are written without quotes; characters are written without the #\ prefix. Example: (display "hello") => hello (display #\a) => a
Syntax: (newline) (newline port) Library: (scheme write) Description: Writes a newline character to the current output port or to the given port. Example: (newline) (newline (open-output-string))
Syntax: (write obj port?) Library: (scheme write) Description: Writes a machine-readable representation of obj to the given port, or the current output port. Strings are written with quotes and special characters escaped. Example: (write '(1 "two" #\3)) => (1 "two" #\3) (write 'hello) => hello
Syntax: (write-shared obj port?) Library: (scheme write) Description: Writes obj to the given port using datum labels (#N= and #N#) to represent all shared and cyclic structure. Example: (let ((x (list 1 2))) (write-shared x)) => (1 2) (write-shared '#0=(a . #0#)) => #0=(a . #0#)
Syntax: (write-simple obj port?) Library: (scheme write) Description: Writes obj to the given port without performing shared-structure detection, making it faster but unable to handle cyclic data. Example: (write-simple '(1 2 3)) => (1 2 3) (write-simple "hello") => "hello"