Question 1

How do I pass data from JavaScript to Elm in my app?

Accepted Answer

Use Elm flags. The learn-elm guide includes a working example where URL data is passed from JavaScript to Elm during initialization, demonstrated in the flags section with a practical setup using npm and elm install.

Question 2

Is Elm better than React for performance?

Accepted Answer

Benchmarks referenced in the README show Elm can be faster due to its optimized virtual DOM and pure functional nature. However, real-world performance depends on the application, and React's larger ecosystem might offer more optimization tools.

Question 3

How to set up testing in an Elm project from scratch?

Accepted Answer

Install elm-test globally via npm, run 'elm test init' to create test files, and use 'elm test --watch' for continuous testing. The guide provides example test formats and links to community resources for deeper learning.

Question 4

Can I use Elm with TypeScript or other JS frameworks?

Accepted Answer

Elm compiles to JavaScript, so it can coexist with TypeScript or frameworks via interop, but there's no direct integration. The guide touches on JavaScript interoperability using flags, but complex integrations require additional setup.

Question 5

What are the biggest drawbacks of switching to Elm?

Accepted Answer

Elm has a smaller ecosystem with fewer libraries, and its strict functional paradigm can be a steep learning curve for teams used to imperative JavaScript. The guide acknowledges this but emphasizes reliability over convenience.

Question 6

How to deploy an Elm application to production?

Accepted Answer

Compile Elm to JavaScript using 'elm make' and deploy the output as static files. The guide's CI setup with Circle CI or Travis CI can automate testing and deployment, but server-side rendering requires extra JavaScript integration.

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