String prepend: Difference between revisions

=={{header|AppleScript}}==

AppleScript text is immutable, so prepending is only possible by creating a new text through concatenation of the variable's existing contents to the other string:

<lang applescript>set aVariable to "world!"

set aVariable to "Hello " & aVariable

return aVariable</lang>

{{output}}

<lang applescript>"Hello world!"</lang>

It's a similar situation with NSString class in AppleScriptObjC. This has various ways of achieving the same thing, probably the most sensible of which is the first of the following:

<lang applescript>use AppleScript version "2.4" -- OS X 10.10 (Yosemite) or later

use framework "Foundation"

set aVariable to current application's class "NSString"'s stringWithString:("world!")

set aVariable to aVariable's stringByReplacingCharactersInRange:({0, 0}) withString:("Hello ")

-- return aVariable as text

-- Or:

set aVariable to current application's class "NSString"'s stringWithString:("world!")

set aVariable to current application's class "NSString"'s stringWithFormat_("%@%@", "Hello ", aVariable)

-- return aVariable as text

-- Or:

set aVariable to current application's class "NSString"'s stringWithString:("world!")

set aVariable to aVariable's stringByReplacingOccurrencesOfString:("^") withString:("Hello ") ¬

options:(current application's NSRegularExpressionSearch) range:({0, 0})

-- return aVariable as text</lang>

But there's also an NS''Mutable''String class. This has 'replace' versions of the 'stringByReplacing' methods above and also this <tt>insertString:atIndex:</tt> method:

<lang applescript>use AppleScript version "2.4" -- OS X 10.10 (Yosemite) or later

use framework "Foundation"

set aVariable to current application's class "NSMutableString"'s stringWithString:("world!")

tell aVariable to insertString:("Hello ") atIndex:(0)

return aVariable as text</lang>

{{output}}

<lang applescript>"Hello world!"</lang>