Idiom #38 Extract a substring

Find substring t consisting in characters i (included) to j (excluded) of string s.
Character indices start at 0 unless specified otherwise.
Make sure that multibyte characters are properly handled.

Haskell

t = drop i (take j s)

T : String := S (I .. J - 1);

#include <stdlib.h>
#include <string.h>

char *t=malloc((j-i+1)*sizeof(char));
strncpy(t,s+i,j-i);

(def t (subs s i j))

#include <string>

auto t = s.substr(i, j-i);

Demo
Doc

var t = s.Substring(i, j - i);

Demo
Doc

auto t = s[i .. j];

var t = s.substring(i, j);

t = String.slice(s, i..j-1)

T = string:sub_string(I, J-1).

character(len=:), allocatable :: t

  t = s(i:j-1)

t := string([]rune(s)[i:j])

Demo

def t = s[i..<j]

Demo
Doc

let t = s.substring(i, j);

let t = s.slice(i, j);

String t = s.substring(i,j);

Demo

val t = s.substring(i, j)

Demo
Doc

(setf u (subseq s i j))

local t = s:sub(i, j - 1)

@import Foundation;

t=[s substringWithRange:NSMakeRange(i,j-i)]

$t = mb_substr($s, $i, $j-$i, 'UTF-8');

t := copy(s,i+1,j-i);

uses Sysutils;

t := s.Substring(i,j-i);

my $chunk = substr("now is the time", $i, $j);

t = s[i:j]

Demo
Origin

t = s[slice(i, j)]

t = s[i..j-1]

Demo
Doc

use substring::Substring;

let t = s.substring(i, j);

extern crate unicode_segmentation;
use unicode_segmentation::UnicodeSegmentation;

let t = s.graphemes(true).skip(i).take(j - i).collect::<String>();

Demo
Doc

extern crate unicode_segmentation;
use unicode_segmentation::UnicodeSegmentation;

let mut iter = s.grapheme_indices(true);
let i_idx = iter.nth(i).map(|x|x.0).unwrap_or(0);
let j_idx = iter.nth(j-i).map(|x|x.0).unwrap_or(0);
let t = s[i_idx..j_idx];