Answers for "how to use string concatenation in javascript"

string concatenation in js

var str1 = "Hello ";
var str2 = "world!";
var res = str1.concat(str2);
console.log(res);

how to concatenate strings and variables in javascript

const helloName = name => `Hello ${name}!`

string concat javascript

//This method adds two or more strings and returns a new single string.

let str1 = new String( "This is string one" ); 
let str2 = new String( "This is string two" ); 
let str3 = str1.concat(str2.toString());
console.log("str1 + str2 : "+str3)

output:
str1 + str2 : This is string oneThis is string two

string concatenation js

var aString="";
aString.concat(value1, value2, ... value_n);