JavaScript Concat Unicode-CodePudding

I am trying to concatenate unicode in JavaScript and i'm getting this error "Invalid Unicode escape sequence". I have tried to search how to concatenate unicodes in javascript and i've seen many examples here on this site but nothing has worked for my code... I found something about using String.fromCharCode too but without a great example. So i could not figure it out.

So. Here is an example code

let test = "5000",
string;

let unicode = test.split()
for(let i = 0; i < unicode.length; i  ) {
    string  = "\u003" unicode[i] "\uFE0F\u20e3";
}

console.log(string);

The unicode[i] returns a number. My first number for variable test is 5 so it should be \u0035\uFE0F\u20E3 for the first number and \u0030\uFE0F\u20E3 for the other three zeroes.

CodePudding user response：

You are trying to concatenate \u003 before the item. Since it is not a unicode character, it is causing the error. Removing the problematic string should fix it.

Also, you have to provide string a default value before concatenating. Otherwise, it is undefined.

let test = "5000",
  string = "";


let unicode = test.split('')

for (let i = 0; i < unicode.length; i  ) {
  string  = unicode[i]   "\uFE0F\u20e3";
}

console.log(string);