tablecloth-base 0.0.10 (latest)

Functions for working with "strings"

type t = string

Create

Strings literals are created with the "double quotes" syntax.

val from_char : char -> string

Converts the given character to an equivalent string of length one.

val from_array : char array -> string

Create a string from an Array of characters.

Note that these must be individual characters in single quotes, not strings of length one.

Examples

String.from_array [||] = ""

String.from_array [|'a'; 'b'; 'c'|] = "abc"

val from_list : char list -> string

Create a string from a List of characters.

Note that these must be individual characters in single quotes, not strings of length one.

Examples

String.from_list [] = ""

String.from_list ['a'; 'b'; 'c'] = "abc"

val repeat : string -> count:int -> string

Create a string by repeating a string count time.

Exceptions

If count is negative, String.repeat throws a RangeError exception.

Examples

String.repeat ~count:3 "ok" = "okokok"

String.repeat ~count:3 "" = ""

String.repeat ~count:0 "ok" = ""

val initialize : int -> f:(int -> char) -> string

Create a string by providing a length and a function to choose characters.

Returns an empty string if the length is negative.

Examples

String.initialize 8 ~f:(Fun.constant '9') = "99999999"

Basic operations

val get : string -> int -> char

Get the character at the specified index

Exceptions

If index out of range, throws a Invalid_argument exception. Concider using getAt, it returns an option<char>

Examples

String.get "stressed" 1 = 't'

val get_at : string -> index:int -> char option

Get the character at ~index

val (.?[]) : string -> int -> char option

The index operator version of get_at

Note Currently this is only supported by the OCaml syntax.

Examples

("Doggie".String.?[3]) = Some 'g'

String.("Doggie".?[9]) = None

val reverse : string -> string

Reverse a string

Note This function does not work with Unicode characters.

Examples

String.reverse "stressed" = "desserts"

val slice : ?to_:int -> string -> from:int -> string

Extract a substring from the specified indicies.

See Array.slice.

Query

val is_empty : string -> bool

Check if a string is empty

val length : string -> int

Returns the length of the given string.

Warning if the string contains non-ASCII characters then length will not equal the number of characters

Examples

String.length "abc" = 3

val starts_with : string -> prefix:string -> bool

See if the string starts with prefix.

Examples

String.starts_with ~prefix:"the" "theory" = true

String.starts_with ~prefix:"ory" "theory" = false

val ends_with : string -> suffix:string -> bool

See if the string ends with suffix.

Examples

String.ends_with ~suffix:"the" "theory" = false

String.ends_with ~suffix:"ory" "theory" = true

val includes : string -> substring:string -> bool

Check if one string appears within another.

Examples

String.includes "team" ~substring:"tea" = true

String.includes "team" ~substring:"i" = false

String.includes "ABC" ~substring:"" = true

val is_capitalized : string -> bool

Test if the first letter of a string is upper case.

Note This function works only with ASCII characters, not Unicode.

Examples

String.is_capitalized "Anastasia" = true

String.is_capitalized "" = false

val drop_left : string -> count:int -> string

Drop count characters from the left side of a string.

Examples

String.drop_left ~count:3 "abcdefg" = "defg"

String.drop_left ~count:0 "abcdefg" = "abcdefg"

String.drop_left ~count:7 "abcdefg" = ""

String.drop_left ~count:(-2) "abcdefg" = "fg"

String.drop_left ~count:8 "abcdefg" = ""

val drop_right : string -> count:int -> string

Drop count characters from the right side of a string.

Examples

String.drop_right ~count:3 "abcdefg" = "abcd"

String.drop_right ~count:0 "abcdefg" = "abcdefg"

String.drop_right ~count:7 "abcdefg" = ""

String.drop_right ~count:(-2) "abcdefg" = "abcdefg"

String.drop_right ~count:8 "abcdefg" = ""

val index_of : string -> string -> int option

Returns the index of the first occurrence of string or None if string has no occurences of string

Examples

String.index_of "Hello World World" "World" = Some 6

String.index_of "Hello World World" "Bye" = None

val index_of_right : string -> string -> int option

Returns the index of the last occurrence of string or None if string has no occurences of string

Examples

String.index_of_right "Hello World World" "World" = Some 12

String.index_of_right "Hello World World" "Bye" = None

val insert_at : string -> index:int -> value:t -> string

Insert a string at index.

The character previously at index will now follow the inserted string.

Examples

String.insert_at ~value:"**" ~index:2 "abcde" = "ab**cde"

String.insert_at ~value:"**" ~index:0 "abcde" = "**abcde"

String.insert_at ~value:"**" ~index:5 "abcde" = "abcde**"

String.insert_at ~value:"**" ~index:(-2) "abcde" = "abc**de"

String.insert_at ~value:"**" ~index:(-9) "abcde" = "**abcde"

String.insert_at ~value:"**" ~index:9 "abcde" = "abcde**"

val to_lowercase : string -> string

Converts all upper case letters to lower case.

Note This function works only with ASCII characters, not Unicode.

Examples

String.to_lowercase "AaBbCc123" = "aabbcc123"

val to_uppercase : string -> string

Converts all lower case letters to upper case.

Note This function works only with ASCII characters, not Unicode.

Examples

String.to_uppercase "AaBbCc123" = "AABBCC123"

val uncapitalize : string -> string

Converts the first letter to lower case if it is upper case.

Note This function works only with ASCII characters, not Unicode.

Examples

String.uncapitalize "Anastasia" = "anastasia"

val capitalize : string -> string

Converts the first letter of s to lowercase if it is upper case.

Note This function works only with ASCII characters, not Unicode.

Examples

String.capitalize "den" = "Den"

val trim : string -> string

Removes leading and trailing whitespace from a string

Examples

String.trim "  abc  " = "abc"

String.trim "  abc def  " = "abc def"

String.trim "\r\n\t abc \n\n" = "abc"

val trim_left : string -> string

Like trim but only drops characters from the beginning of the string.

val trim_right : string -> string

Like trim but only drops characters from the end of the string.

val pad_left : string -> int -> with_:string -> string

Pad a string up to a minimum length

If the string is shorted than the proivded length, adds with_ to the left of the string until the minimum length is met

Examples

String.pad_left "5" 3 ~with_:"0" = "005"

val pad_right : string -> int -> with_:string -> string

Pad a string up to a minimum length

If the string is shorted than the proivded length, adds with to the left of the string until the minimum length is met

Examples

String.pad_right "Ahh" 7 ~with_:"h" = "Ahhhhhh"

val uncons : string -> (char * string) option

Returns, as an Option, a tuple containing the first Char and the remaining String.

If given an empty string, returns None.

Examples

String.uncons "abcde" = Some ('a', "bcde")

String.uncons "a" = Some ('a', "")

String.uncons "" = None

val split : string -> on:string -> string list

Divide a string into a list of strings, splitting whenever on is encountered.

Examples

String.split ~on:"/" "a/b/c" = ["a"; "b"; "c"]
String.split ~on:"--" "a--b--c" = ["a"; "b"; "c"]
String.split ~on:"/" "abc" = ["abc"]
String.split ~on:"/" "" = [""]
String.split ~on:"" "abc" = ["a"; "b"; "c"]

Iterate

val for_each : string -> f:(char -> unit) -> unit

Run f on each character in a string.

val fold : string -> initial:'a -> f:('a -> char -> 'a) -> 'a

Like Array.fold but the elements are Chars

Convert

val to_array : string -> char array

Returns an Array of the individual characters in the given string.

Examples

String.to_array "" = [||]

String.to_array "abc" = [|'a'; 'b'; 'c'|]

val to_list : string -> char list

Returns a List of the individual characters in the given string.

Examples

String.to_list "" = []

String.to_list "abc" = ['a'; 'b'; 'c']

Compare

val equal : string -> string -> bool

Test two string for equality

val compare : string -> string -> int

Compare two strings. Strings use 'dictionary' ordering. 1 Also known as lexicographical ordering.

Examples

String.compare "Z" "A" = 1

String.compare "Be" "Bee" = -1

String.compare "Pear" "pear" = 1

String.compare "Peach" "Peach" = 0

type identity

The unique identity for Comparator

val comparator : (t, identity) Base.Comparator.t

package tablecloth-base

Create

Basic operations

Query

Iterate

Convert

Compare