Concatenating Two or More Strings

You can concatenate or combine two or more strings using the + and += assignment operators.

var hello = "Hello";
var world = "World";
var greet = hello + " " + world;
document.write(greet); // Prints: Hello World
 
var wish  = "Happy";
    wish += " New Year";
document.write(wish); // Prints: Happy New Year

JavaScript also provides concat() method to combine strings, but it is not recommended.