8000 Added substr function. by skx · Pull Request #88 · skx/yal · GitHub
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Added substr function. #88

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Merged
merged 1 commit into from
Nov 12, 2022
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Added substr function. #88

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19 changes: 19 additions & 0 deletions stdlib/stdlib/string-substr.lisp
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Original file line number Diff line number Diff line change
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;;; string-substr.lisp - Fetch substrings from a string

;; String handling is good to have, and here we implement substr in the
;; naive way:
;;
;; Split the string into a list, and take parts of it using "take" and
;; "drop".
;;


(set! substr (fn* (str start &len)
"Return a substring of the given string, by starting index.

The length of the substring is optional."
(if (> start (strlen str)) ; out of bounds?
""
(if (nil? len) ; start at the given offset
(join (drop start (explode str)))
(join (take (car len) (drop start (explode str))))))))
0