3 String utilities

(require (planet untyped/unlib/string))

Useful string utilities. Compatible with PLT 4 languages.

(string+false? item) → boolean?

item : any

Returns #t if item is a string or #scheme[#f].

(ensure-string item) → any

item : any

Converts bytes arguments to strings: passes all other arguments straight through.

(string-delimit   items             delimiter            [ #:prefix prefix             #:suffix suffix])   →   string?

items : (listof string?)

delimiter : string?

prefix : (U string? #f) = #f

suffix : (U string? #f) = #f

Similar to string-join from SRFI 13, except that the optional #:prefix and #:suffix arguments can be provided to add a prefix or suffix string.

Examples:

> (string-delimit '("1" "2" "3") ",")

"1,2,3"

> (string-delimit '("1" "2" "3") "," #:prefix "[")

"[1,2,3"

> (string-delimit '("1" "2" "3") "," #:suffix "]")

"1,2,3]"

> (string-delimit '("1" "2" "3") "," #:prefix "[" #:suffix "]")

"[1,2,3]"

> (string-delimit '("1" "2" "3") "," #:prefix #f #:suffix #f)

"1,2,3"