History of Idiom 46 > diff from v19 to v20

Edit summary for version 20 by :

↷

Version 19

2015-10-08, 12:53:53

Version 20

2015-10-29, 14:05:14

Idiom #46 Extract beginning of string (prefix)

Create string t consisting of the 5 first characters of string s.

Idiom #46 Extract beginning of string (prefix)

Create string t consisting of the 5 first characters of string s.

Haskell

Haskell

Imports

import qualified Data.Text as T

Imports

import qualified Data.Text as T

Code

t :: T.Text
t = T.take 5 s

Code

t :: T.Text
t = T.take 5 s

Comments bubble

This implementation uses the Text type, imported as suggested in the Text library documentation.

Comments bubble

This implementation uses the Text type, imported as suggested in the Text library documentation.

Doc URL

https://hackage.haskell.org/package/text

Doc URL

https://hackage.haskell.org/package/text

Haskell

Haskell

Code

t :: String
t = take 5 s

Code

t :: String
t = take 5 s

Comments bubble

The function take has two arguments: the number of characters to take as a prefix, and the string to take the prefix from. The function take is in the Haskell prelude and doesn't need to be imported.

The type signature is optional, and could be omitted leaving the second line.

Comments bubble

Dart

Dart

Code

var t = s.substring(0, 5);

Code

var t = s.substring(0, 5);

Doc URL

https://api.dartlang.org/apidocs/channels/stable/dartdoc-viewer/dart-core.String#id_substring

Doc URL

https://api.dartlang.org/apidocs/channels/stable/dartdoc-viewer/dart-core.String#id_substring

Code

var t = s.substring(0,5);

Code

var t = s.substring(0,5);

Comments bubble

s.substr(0,5) would also work in that specific case.

Comments bubble

s.substr(0,5) would also work in that specific case.

Doc URL

https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/String/substring

Doc URL

https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/String/substring

Java

Java

Code

String t = s.substring(0,5);

Code

String t = s.substring(0,5);

Comments bubble

s must not be null.

Comments bubble

s must not be null.

↶ Previous change

Next change ↷

History of Idiom 46 > diff from v19 to v20

Version 19

Version 20

Idiom #46 Extract beginning of string (prefix)

Idiom #46 Extract beginning of string (prefix)

Imports

Imports

Code

Code

Comments bubble

Comments bubble

Doc URL

Doc URL

Code

Code

Comments bubble

Comments bubble

Code

Code

Doc URL

Doc URL

Code

Code

Comments bubble

Comments bubble

Doc URL

Doc URL

Code

Code

Comments bubble

Comments bubble

Please choose a nickname before doing this