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sugar/string.rkt

17 lines
690 B
Racket

#lang racket/base
(require "define.rkt" "coerce.rkt")
(define+provide/contract (starts-with? str starter)
(coerce/string? coerce/string? . -> . coerce/boolean?)
(and (<= (string-length starter) (string-length str))
(equal? (substring str 0 (string-length starter)) starter)))
(define+provide/contract (ends-with? str ender)
(coerce/string? coerce/string? . -> . coerce/boolean?)
(and (<= (string-length ender) (string-length str))
(equal? (substring str (- (string-length str) (string-length ender)) (string-length str)) ender)))
(define+provide/contract (capitalized? str)
(coerce/string? . -> . coerce/boolean?)
(char-upper-case? (car (string->list str))))