[Solved] Wrap a given input string in double quotes if not already wrapped

Question

A short and simple way is just to test the first and last characters:

var input = // whatever
var wrapped = input;
if ('"' === wrapped || !('"' === wrapped[0] && '"' === wrapped.slice(-1)))
  wrapped = '"' + wrapped + '"';

(This works even on empty strings, because ''[0] is undefined and ''.slice(-1) is '', neither of which cause a problem in the if condition.)

You don’t say what to do if the input is just a single double-quote character, but I’ve assumed for the input '"' the output will be '"""'. If that’s not what you want obviously you can modify the code above.

Accepted Answer

A short and simple way is just to test the first and last characters:

var input = // whatever
var wrapped = input;
if ('"' === wrapped || !('"' === wrapped[0] && '"' === wrapped.slice(-1)))
  wrapped = '"' + wrapped + '"';

(This works even on empty strings, because ''[0] is undefined and ''.slice(-1) is '', neither of which cause a problem in the if condition.)

You don’t say what to do if the input is just a single double-quote character, but I’ve assumed for the input '"' the output will be '"""'. If that’s not what you want obviously you can modify the code above.