How can I convert a string into a unicode character?

Question

In Javascript \'\\uXXXX\' returns in a unicode character. But how can I get a unicode character when the XXXX part is a variable?

For example:<

Answer 1

Since ES5 you can use

String.fromCodePoint(number)

to get unicode values bigger than 0xFFFF.

So, in every new browser, you can write it in this way:

var input = '2122';
console.log(String.fromCodePoint(input));

or if it is a hex number:

var input = '2122';
console.log(String.fromCodePoint(parseInt(input, 16)));

More info:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/fromCodePoint