I have some experience with Java and I know that strings concatenation with "+" operator produces new object.
I'd like to know how to do it in JS in the best way, what is the best practice for it?
MDN has the following to say about
It is strongly recommended to use the string concatenation operators (+, +=) instead of this method for perfomance reasons
Also see the link by @Bergi.
In JS, "+" concatenation works by creating a new
For example, with...
var s = "Hello";
...we have one object s.
s = s + " World";
Now, s is a new object.
2nd method: String.prototype.concat
There was a time when adding strings into an array and finalising the string by using
join was the fastest/best method. These days browsers have highly optimised string routines and it is recommended that
+= methods are fastest/best
concat()function because this function only applies to a string, not on a integer. but we can concatenate a string to a number(integer) using + operator.
<!DOCTYPE html> <html> <body> <p>The concat() method joins two or more strings</p> <p id="demo"></p> <p id="demo1"></p> <script> var text1 = 4; var text2 = "World!"; document.getElementById("demo").innerHTML = text1 + text2; //Below Line can't produce result document.getElementById("demo1").innerHTML = text1.concat(text2); </script> <p><strong>The Concat() method can't concatenate a string with a integer </strong></p> </body> </html>
You can try with this code (Same case)
chaine1 + chaine2;
I suggest you also (I prefer this) the string.concat method
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