Calculator App done with Vanilla JS

Community feedback

• 

  

  Chamu•13,820

  @ChamuMutezva

  Posted over 2 years ago

  Hi Daniel Hameed

  I will add more to what have been said above.

  • the html for the theme switcher will need some revision, it is ideal to use radio buttons in a fieldset. Radio buttons allow one selection from a group which is exactly what we need. You have used p elements and div elements which are not accessible to assistive technology users and at the same time there is repetition of interaction where both the p and divs all have click events for the same purpose.
  • add focus state that can assist keyboard users know where the current focus is when tabbing on a keyboard.
  • let your calculator have maximum number that can be entered , we can not have a calculator that takes any number that the user desires.
  • a calculator should guard against some of the following , try it in your calculator

  1. 9++++++
  2. 9++++++*******----
  3. 4.......3.36...

  • try the following calculation 0.1+0.2

  I concur with @elaineleung on the need to do challenges of a lower level than this one . This calculator has some twist and turns that needs to be carefully implemented . I would suggest the tip calculator for now

  Happy coding

  21

  Marked as helpful
• 

  Elaine•11,360

  @elaineleung

  Posted over 2 years ago

  Hi Daniel, good attempt in building this project, and I just wanted to answer your question about eval():

  I also used eval() at first, but after reading up more about it on MDN and reading Stack Overflow posts that explain why it shouldn't be used, I ended up using a switch statement for the four operators. Here's the link to the MDN article on eval(), and I highly recommend that you read it and consider whether to use eval(): https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/eval

  Anyway, I tried out your calculator, and I really only got three main comments:

  1. I think you need to write a bit more logic in your function for the computation, and I also think you need to have a look at how real-life calculators work (whether they are single-step or expression evaluators). I know there aren't too many specific instructions for this challenge, but I think it should be assumed that this calculator is meant to function in a way that real-life calculators function. What this means is that, let's say I enter "3", "+", and then "5"; I get the answer "8", which is the desirable and correct answer. Then say I wanted to input another number for the next calculation, and that number is "2". What I see on the screen is not "2" but "82" because the display is not cleared and the calculator simply appends the new digit to the previous answer.

  2. Good job in getting the themes to work! The only thing is that, how the JS is written is rather clunky and hard to read, as it's a bit too repetitive right now with all the adding and removing of classes. I also don't think this is the most ideal way to write the theme function. I would suggest that you look into how else the themes can be wired up and do try some refactoring and use of forEach or a for loop.

  3. You have quite a number of issues in your HTML report! Some of involve very fundamental principles being broken, such as id being used more than once. I think you'll need to be careful here and try to remember the basics as you're writing your HTML.

  In reviewing your work here, I suggest that you try a few more Junior level projects first that involve writing JS before you tackle more intermediate projects, which I think are a bit beyond your level right now. Otherwise you may find those projects quite challenging! Good luck, and keep going 😊

  21

  Marked as helpful
• 

  Lucas 👾•104,160

  @correlucas

  Posted over 2 years ago

  👾Hi Daniel Hameed, congrats on completing this challenge!

  Nice solution and nice code! I can see that you paid a lot of attention to your code/design. If you don’t mind I’ve some tips for you:

  Your component is okay but its missing the vertical alignment. The best way to do it is by using flexbox. First step is to add min-height: 100vh to make the body height size becomes 100% of the screen height, this way you make sure that whatever the situation the child element (the container) align the body and then use the flex properties for alignment with display: flex / align-items: center; / justify-content: center;

  REMOVE THE MARGIN:

  .calculator {
      width: 450px;
      /* margin: 5% auto; */
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 1em;
  }
  

  ADD MIN-HEIGHT: 100VH AND FLEX:

  body {
      min-height: 100vh;
      background-color: hsl(222, 26%, 31%);
      display: flex;
      align-items: center;
      justify-content: center;
      flex-direction: column;
  }
  

  ✌️ I hope this helps you and happy coding!

  11

  Marked as helpful