At this point, if the calculator shows 0 the default numberthe target number should replace zero. If the key has a data-action that is either addsubtractmultiply or dividewe know the key is an operator. Next, we can use the data-action attribute to determine the type of key that is clicked. In this case, we can use an event delegation pattern to listen, since keys are all children of. The first steps to building this calculator are to be able to 1 listen for all keypresses and 2 determine the type of key that is pressed. You can find the starter file at this pen. This has already been done for you in the starter file. I urge you to try and build the calculator yourself before following the lesson. Minimally, you need to know these things. Before you attempt follow through the lesson, please make sure you have a decent command of JavaScript. This is an epic article where you learn how to build a calculator from scratch.
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