How to make a calculator in JavaScript?

Posted by: Hamza Comments: 0

How to make a calculator in JavaScript?

Making a calculator in JavaScript is a good beginner project for developers who are just starting with the language. Here’s a step-by-step guide to creating a simple calculator:

  1. Set up the HTML structure: Create an HTML file and include the necessary elements, such as the calculator display and the buttons.
<div id="calculator">
  <input type="text" id="display">
  <button id="button-1">1</button>
  <button id="button-2">2</button>
  <button id="button-3">3</button>
  <button id="button-plus">+</button>
  <button id="button-4">4</button>
  <button id="button-5">5</button>
  <button id="button-6">6</button>
  <button id="button-minus">-</button>
  <button id="button-7">7</button>
  <button id="button-8">8</button>
  <button id="button-9">9</button>
  <button id="button-multiply">*</button>
  <button id="button-clear">C</button>
  <button id="button-0">0</button>
  <button id="button-equals">=</button>
  <button id="button-divide">/</button>
  1. Style the calculator using CSS: Use CSS to style the calculator display and the buttons, giving them a specific look and feel.
  2. Create the JavaScript logic: Using JavaScript, create a function for each button that updates the display and performs the corresponding operation when a button is clicked. You’ll also need to create a function that clears the display and resets the calculator.
let display = document.getElementById("display");

function updateDisplay(value) {
  display.value += value;

function clearDisplay() {
  display.value = "";

function calculate() {
  let result = eval(display.value);
  display.value = result;
  1. Add event listeners: Use JavaScript to add event listeners to the buttons so that the corresponding function is called when the button is clicked.
document.getElementById("button-1").addEventListener("click", function() {

document.getElementById("button-2").addEventListener("click", function() {

document.getElementById("button-3").addEventListener("click", function() {

// Repeat for all the other buttons

document.getElementById("button-clear").addEventListener("click", function() {

document.getElementById("button-equals").addEventListener("click", function() {
  1. Test and debug the calculator: Test the calculator thoroughly and fix any bugs or issues that arise.

Here are some resources to help you get started with making a calculator in JavaScript:

Good luck with your project!

    <li v-for="item in items" :key="">
      {{ }}

export default {
  props: {
    items: {
      type: Array,
      required: true,


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