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String(3) OCaml library String(3)
NAME
String - String operations.
Module
Module String
Documentation
Module String
: sig end
String operations.
val length : string -> int
Return the length (number of characters) of the given string.
val get : string -> int -> char
String.get s n returns character number n in string s The first character is character
number 0. The last character is character number String.length s - 1 You can also write
s.[n] instead of String.get s n
Raise Invalid_argument index out of bounds if n is outside the range 0 to (String.length s
- 1)
val set : string -> int -> char -> unit
String.set s n c modifies string s in place, replacing the character number n by c You can
also write s.[n] <- c instead of String.set s n c Raise Invalid_argument index out of
bounds if n is outside the range 0 to (String.length s - 1)
val create : int -> string
String.create n returns a fresh string of length n The string initially contains arbitrary
characters. Raise Invalid_argument if n < 0 or n > Sys.max_string_length
val make : int -> char -> string
String.make n c returns a fresh string of length n , filled with the character c Raise
Invalid_argument if n < 0 or n > Sys.max_string_length
val copy : string -> string
Return a copy of the given string.
val sub : string -> int -> int -> string
String.sub s start len returns a fresh string of length len , containing the characters
number start to start + len - 1 of string s Raise Invalid_argument if start and len do not
designate a valid substring of s ; that is, if start < 0 , or len < 0 , or start + len >
String.length s
val fill : string -> int -> int -> char -> unit
String.fill s start len c modifies string s in place, replacing the characters number
start to start + len - 1 by c Raise Invalid_argument if start and len do not designate a
valid substring of s
val blit : string -> int -> string -> int -> int -> unit
String.blit src srcoff dst dstoff len copies len characters from string src , starting at
character number srcoff , to string dst , starting at character number dstoff correctly
even if src and dst are the same string, and the source and destination chunks overlap.
Raise Invalid_argument if srcoff and len do not designate a valid substring of src , or if
dstoff and len do not designate a valid substring of dst
val concat : string -> string list -> string
String.concat sep sl concatenates the list of strings sl , inserting the separator string
sep between each.
val iter : (char -> unit) -> string -> unit
String.iter f s applies function f in turn to all the characters of s f s.[0]; f s.[1];
...; f s.[String.length s - 1]; ()
val escaped : string -> string
Return a copy of the argument, with special characters represented by escape sequences,
following the lexical conventions of Objective Caml. If there is no special character in
the argument, return the original string itself, not a copy.
val index : string -> char -> int
String.index s c returns the position of the leftmost occurrence of character c in string
s Raise Not_found if c does not occur in s
val rindex : string -> char -> int
String.rindex s c returns the position of the rightmost occurrence of character c in
string s Raise Not_found if c does not occur in s
val index_from : string -> int -> char -> int
Same as String.index , but start searching at the character position given as second argu-
ment. String.index s c is equivalent to String.index_from s 0 c
val rindex_from : string -> int -> char -> int
Same as String.rindex , but start searching at the character position given as second
argument. String.rindex s c is equivalent to String.rindex_from s (String.length s - 1) c
val contains : string -> char -> bool
String.contains s c tests if character c appears in the string s
val contains_from : string -> int -> char -> bool
String.contains_from s start c tests if character c appears in the substring of s starting
from start to the end of s Raise Invalid_argument if start is not a valid index of s
val rcontains_from : string -> int -> char -> bool
String.rcontains_from s stop c tests if character c appears in the substring of s starting
from the beginning of s to index stop Raise Invalid_argument if stop is not a valid index
of s
val uppercase : string -> string
Return a copy of the argument, with all lowercase letters translated to uppercase, includ-
ing accented letters of the ISO Latin-1 (8859-1) character set.
val lowercase : string -> string
Return a copy of the argument, with all uppercase letters translated to lowercase, includ-
ing accented letters of the ISO Latin-1 (8859-1) character set.
val capitalize : string -> string
Return a copy of the argument, with the first character set to uppercase.
val uncapitalize : string -> string
Return a copy of the argument, with the first character set to lowercase.
type t = string
An alias for the type of strings.
val compare : t -> t -> int
The comparison function for strings, with the same specification as Pervasives.compare t ,
this function compare allows the module String to be passed as argument to the functors
Set.Make and Map.Make
OCamldoc 2005-03-23" String(3)
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