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JavaScript Tutorial 2 : JS Calculator



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In this video I continue teaching JavaScript and related JavaScript libraries and frameworks while making a JavaScript Calculator in 1 video.

I design everything using BootStrap. We’ll cover the logic of the calculator using a simple diagram. Then we’ll make a working calculator using our acquired knowledge on functions, if statements and the catching of events which was covered last time. It is amazing how much we can do with so little.

This 45 minute tutorial only has one 5 second skippable ad. Please consider not Ad Blocking it so that I can continue making free tutorials.

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27 responses to “JavaScript Tutorial 2 : JS Calculator”

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  3. hey! thank you for the great tutorial!
    I'm thinking of adding something to it
    Right now I cannot do consecutive calculations like 1+2+3 without hitting the equal button twice.
    Is there a way I can do that by modifying your code or it's another logic?

  11. You Explained very nicely as well very clearly. I really thank you for this type of video tutorial for us. Can you create Form Validation as well error display in HTML itself? We want to know how to populate error message in dynamically when user clicks SUBMIT Button.

    Thanks Advance

  14. Hello Derek and thank you for the JS series. I am trying to add a DELETE button to my calculator. This is my thinking:
    Declare an empty array, resultArr = [];
    Inside the numButPress function, i named mine numClick, I have resultArr.push(num). I can get the numbers that are clicked by the user to push to resultArr just fine but my deleteNum isn't working and I'm not sure how to finish it. Here is my function:

    const deleteNum = (num) => {

    document.getElementById("display").value;

    resultArr.pop(num);

    }

    Can you, or anyone offer any advice? Here is the link the the repl:
    https://repl.it/@adt71/Javascript-Calculator

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