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Veja: http://www.mspc.eng.br/info/jscriptString.shtml
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Interessante que na documentação no link postado ele fala apenas em ASCII.
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fromCharCode
Definition and Usage
The fromCharCode() method converts Unicode values to characters.
Note: This method is a static method of the String object. The syntax is always String.fromCharCode() and not string.fromCharCode().
Syntax
String.fromCharCode(n1, n2, ..., nX)
| Parameter | Description |
| n1, n2, ..., nX | Required. One or more Unicode values to be converted |
fonte: http://www.mspc.eng.br/info/jscriptString.shtml
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<!DOCTYPE html>
<html>
<body>
<p id="demo">Click the button to display characters of the specified unicode numbers.</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction()
{
var n=String.fromCharCode(72,69,76,76,79);
document.getElementById("demo").innerHTML=n;
}
</script>
</body>
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Questao mal feita. O comando converte o código para o caractere. Nao tem nada a ver com concatenar.
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I) Convert a Unicode number into a character:
var res = String.fromCharCode(65) = A;
II) Join two strings:
var str1 = "Hello ";
var str2 = "world!";
var res = str1.concat(str2) = “Hello World”
III) Return the Unicode of the first character in a string (the Unicode value for "H"):
var str = "HELLO WORLD";
var n = str.charCodeAt(0) = 72;
IV) Search a string for "ain":
var str = "The rain in SPAIN stays mainly in the plain";
var res = str.match(/ain/g) = "ain,ain,ain";
V) Return the first character of a string:
var str = "HELLO WORLD";
var res = str.charAt(0) = "H";
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Que questão mal feita! "fromCharCode" converte um número Unicode para um caracter. O que tem haver?????