So 5 * 20 - 14 = should give 86 as the result. Enter 12 + 10 = in the calculator and notice that the correct Also, the value of firstOperand is updated to the result so that it This result is subsequently displayed to the user by updating the displayValue The result is saved in the result variable. If so, the calculate function is invoked and The else if block added to handleOperator checks if the operator property An example of a valid expression is shown below:Ĭonst calculator = (addition, subtraction, multiplication and division) on our calculator app byĬonstructing a valid expression using the input buttons, and have the resultĭisplayed on the screen. Getting startedĪnyone should be able to perform the four most common arithmetic operations Feel free to do this tutorial on other online code playgrounds Start by forking the code to a new fiddle, and follow along by typing each step The calculator layout was crafted, but I made a few minor changes so make sure It contains all the necessary markup and styles Before you beginįor this tutorial on JSFiddle.
You have no prior experience with building applications in the browser. To break down each step as best as I can so it should be easy to follow even if This tutorial assumes that you have a basic knowledge of JavaScript. You can play around with it to get a feel of what you’ll be building On the JavaScript logic employed to make the calculator work. If you’d like to learn how it was achieved, be sure to check out this More or less in the manner of those calculators found at grocery stores. The calculator app we’ll develop in this tutorial is a very simple one.
5 How to build a Custom HTML5 Video Player with JavaScript.4 How to build a Todo List App with JavaScript.3 How to build a Calculator App with JavaScript.2 How to build a Wikipedia Search App with JavaScript.1 Build your first JavaScript App - A Random Quote Generator.JavaScript projects for beginners (8 part This epic tutorial provides a solid workout for JavaScript newbies by describing how a simple calculator application can be developed with the language. Updated on JanuHow to build a Calculator App with JavaScript