How to Add Space Between Variables in Javascript

In this tutorial, you will learn how to add space between variables in javascript. A variable in programming is a value that can change based on external factors or data that has been supplied to the program. For a newbie developer, it can be a bit tricky to add space between variables.

There are numerous ways to add space between variables. But for the sake of simplicity, we will make use of addition operator (+) which helps in concatenating two individual strings.

In the following example, we have two global variables. Upon click of a button, we will add space between variables and display the result on the screen.  Please have a look over the code example and the steps given below.


  • We have 3 elements in the HTML file (div, button, and h1). The div element is just a wrapper for the rest of the elements.
  • The innerText for the button element is “Add” and for the h1 element, it is “Result”.
  • We have done some basic styling using CSS and added the link to our style.css stylesheet inside the head element.
  • We have also included our javascript file script.js with a script tag at the bottom.
<!DOCTYPE html>
<html lang="en">

  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <link rel="stylesheet" href="style.css">


  <div class="container">    

  <script src="script.js"></script>

.container {        
    text-align: center;

button {
  margin-top: 10px;
  padding: 10px 20px;


  • We have selected the button element and h1 element using the document.querySelector() method and stored them in btnAdd and output variables respectively.
  • We have two global variables firstName and lastName. They both hold a string as a value.
  • We are concatenating both the variables using addition operator (+) and displaying in the h1 element using innerText property.
  • We have attached a click event listener to the button element.
  • In the event handler function, we have a single whitespace stored in the mySpace variable. We are concatenating all 3 variables using addition operator (+).
  • We are storing the final string in the result variable. It will not be clearly visible in the HTML document, but you can check developer console window in Chrome to see the actual output.
  • We are displaying the result in the h1 element using the innerText property.
let btnAdd = document.querySelector("button");
let output = document.querySelector("h1");

let firstName = `John`;
let lastName = `Raymond`;
output.innerText =  firstName + lastName;
btnAdd.addEventListener("click", () => {  
  let mySpace = " "
  let result = firstName + mySpace + lastName;
  output.innerText = result;