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Solution
Submitted 11 months ago

Calculator PWA built w/ HTML, CSS, Typescript, Rust and Web Assembly

accessibility, pwa, tailwind-css, vite, typescript
princemuel•135
@princemuel
A solution to the Calculator app challenge
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Solution retrospective


What are you most proud of, and what would you do differently next time?
  • I built a lexer, token parser and evaluator for the calculator to evaluate expressions. It was an enlightening process. I got to understand a bit of how programming languages are created.
  • I made the app into a progressive web app, able to work offline with cached assets. It is also installable on chromium based browsers and once installed, works as a native mobile/desktop app. It is also very lightweight ~200kb.
What challenges did you encounter, and how did you overcome them?

Some of the challenges I encountered were:

  • Ensuring the input expressions were valid. I fixed that in the Rust backend by creating a lexer, token parser and evaluator. The current issue is integrating that in the frontend.
What specific areas of your project would you like help with?

Handling Input/Output in JavaScript

Currently, the calculator's Rust/Wasm backend is parsing the input properly. The issue is setting up the JavaScript frontend to properly validate the user's input and make sure the correct values are sent to the backend

Code
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How does the accessibility report work?

When a solution is submitted, we use axe-core to run an automated audit of your code.

This picks out common accessibility issues like not using semantic HTML and not having proper heading hierarchies, among others.

This automated audit is fairly surface level, so we encourage to you review the project and code in more detail with accessibility best practices in mind.

How does the CSS report work?

When a solution is submitted, we use stylelint to run an automated check on the CSS code.

We've added some of our own linting rules based on recommended best practices. These rules are prefixed with frontend-mentor/ which you'll see at the top of each issue in the report.

The report will audit all CSS, SCSS and Less files in your repository.

How does the HTML validation report work?

When a solution is submitted, we use html-validate to run an automated check on the HTML code.

The report picks out common HTML issues such as not using headings within section elements and incorrect nesting of elements, among others.

Note that the report can pick up “invalid” attributes, which some frameworks automatically add to the HTML. These attributes are crucial for how the frameworks function, although they’re technically not valid HTML. As such, some projects can show up with many HTML validation errors, which are benign and are a necessary part of the framework.

How does the JavaScript validation report work?

When a solution is submitted, we use eslint to run an automated check on the JavaScript code.

The report picks out common JavaScript issues such as not using semicolons and using var instead of let or const, among others.

The report will audit all JS and JSX files in your repository. We currently do not support Typescript or other frontend frameworks.