How to remove ↵ character from JS string

works fine.

If it works fine, then why bother? Your solution is totally acceptable.

but I want to know is there is any other way to remove these kind of unnecessary characters.

You could also use

"↵select * from eici limit 10".split("↵").join("") 

Instead of using the literal character, you can use the codepoint.

Instead of "↵" you can use "\u21b5".

To find the code, use '<character>'.charCodeAt(0).toString(16), and then use like \u<number>.

Now, you can use it like this:

string.split("\u21b5").join(''); //split+join

string.replace(/\u21b5/g,'');  //RegExp with unicode point

You can also try regex as well,

"↵select * from eici limit 10".replace(/↵/g, "")