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<ol class="chapter"><li><a href="index.html"><strong aria-hidden="true">1.</strong> Hello, Gleam!</a></li><li><a href="getting-started/index.html"><strong aria-hidden="true">2.</strong> Getting started</a></li><li><ol class="section"><li><a href="getting-started/installing-gleam.html"><strong aria-hidden="true">2.1.</strong> Installing Gleam</a></li><li><a href="getting-started/installing-erlang.html"><strong aria-hidden="true">2.2.</strong> Installing Erlang</a></li><li><a href="getting-started/editor-support.html"><strong aria-hidden="true">2.3.</strong> Editor support</a></li><li><a href="getting-started/creating-a-project.html"><strong aria-hidden="true">2.4.</strong> Creating a project</a></li><li><a href="getting-started/example-projects.html"><strong aria-hidden="true">2.5.</strong> Example projects</a></li></ol></li><li><a href="tour/index.html"><strong aria-hidden="true">3.</strong> Language tour</a></li><li><ol class="section"><li><a href="tour/comments.html"><strong aria-hidden="true">3.1.</strong> Comments</a></li><li><a href="tour/string.html"><strong aria-hidden="true">3.2.</strong> String</a></li><li><a href="tour/bool.html"><strong aria-hidden="true">3.3.</strong> Bool</a></li><li><a href="tour/int-and-float.html"><strong aria-hidden="true">3.4.</strong> Int & Float</a></li><li><a href="tour/let.html"><strong aria-hidden="true">3.5.</strong> Let bindings</a></li><li><a href="tour/list.html"><strong aria-hidden="true">3.6.</strong> List</a></li><li><a href="tour/case.html"><strong aria-hidden="true">3.7.</strong> Case</a></li><li><a href="tour/function.html"><strong aria-hidden="true">3.8.</strong> Function</a></li><li><a href="tour/module.html"><strong aria-hidden="true">3.9.</strong> Module</a></li><li><a href="tour/struct.html"><strong aria-hidden="true">3.10.</strong> Struct</a></li><li><a href="tour/enum.html"><strong aria-hidden="true">3.11.</strong> Enum</a></li><li><a href="tour/external-function.html"><strong aria-hidden="true">3.12.</strong> External function</a></li><li><a href="tour/external-type.html"><strong aria-hidden="true">3.13.</strong> External type</a></li></ol></li><li><a href="faqs.html" class="active"><strong aria-hidden="true">4.</strong> FAQs</a></li></ol>
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<h1 class="menu-title">The Gleam Book</h1>
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<main>
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<h1><a class="header" href="#faqs" id="faqs">FAQs</a></h1>
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<ul>
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<li><a href="#why-is-the-compiler-written-in-rust">Why is the compiler written in Rust?</a></li>
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<li><a href="#will-gleam-have-type-classes">Will Gleam have type classes?</a></li>
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<li><a href="#how-is-message-passing-typed">How is message passing typed?</a></li>
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<li><a href="#how-does-gleam-compare-to-alpaca">How does Gleam compare to Alpaca?</a></li>
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<li><a href="#should-i-put-gleam-in-production">Should I put Gleam in production?</a></li>
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<li><a href="#is-it-good">Is it good?</a></li>
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</ul>
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<h2><a class="header" href="#why-is-the-compiler-written-in-rust" id="why-is-the-compiler-written-in-rust">Why is the compiler written in Rust?</a></h2>
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<p>Prototype versions of the Gleam compiler was written in Erlang, but a switch was
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made to Rust as the lack of static types was making refactoring a slow and
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error prone process. A full Rust rewrite of the prototype resulted in the
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removal of a lot of tech debt and bugs, and the performance boost is nice too!</p>
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<p>One day Gleam may have a compiler written in Gleam, but for now we are focused
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on developing other areas of the language such as libraries, tooling, and
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documentation.</p>
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<h2><a class="header" href="#will-gleam-have-type-classes" id="will-gleam-have-type-classes">Will Gleam have type classes?</a></h2>
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<p>Some form of ad-hoc polymorphism could be a good addition to the ergonomics of
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the language, though what shape that may take is unclear. Type classes are one
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option, OCaml style implicit modules are another, or perhaps it'll be
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something else entirely.</p>
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<h2><a class="header" href="#how-is-message-passing-typed" id="how-is-message-passing-typed">How is message passing typed?</a></h2>
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<p>Gleam doesn't currently have first class support for the BEAM's
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concurrency primitives such as <code>receive</code>, <code>send</code>, and <code>spawn</code>. This is because
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research is still ongoing as to the best way to apply a strong type system to
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them while still enabling established OTP patterns. For now these primitives
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should be used via the Erlang FFI, making them dynamically typed.</p>
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<p>Many OTP patterns such as <code>gen_server</code> are functional in nature and don't
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require direct use of these primitives so these behaviours can be implemented
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in Gleam today.</p>
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<h2><a class="header" href="#how-does-gleam-compare-to-alpaca" id="how-does-gleam-compare-to-alpaca">How does Gleam compare to Alpaca?</a></h2>
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<p><a href="https://github.com/alpaca-lang/alpaca">Alpaca</a> is similar to Gleam in that it is a statically typed language
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for the Erlang VM that is inspired by the ML family of languages. It's a
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wonderful project and we hope they are wildly successful!</p>
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<p>Here's a non-exhaustive list of differences:</p>
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<ul>
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<li>Alpaca functions are auto-curried, Gleam's are not.</li>
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<li>Alpaca's unions can be untagged, with Gleam all variants in an enum need a
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name.</li>
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<li>Alpaca's compiler is written in Erlang, Gleam's is written in Rust.</li>
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<li>Alpaca's syntax is closer to ML family languages, Gleam's is closer to C
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family languages.</li>
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<li>Alpaca compiles to Core Erlang, Gleam compiles to regular Erlang.</li>
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</ul>
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<p>Alpaca is great, check it out! :)</p>
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<h2><a class="header" href="#should-i-put-gleam-in-production" id="should-i-put-gleam-in-production">Should I put Gleam in production?</a></h2>
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<p>Probably not. Gleam is a very young language and there may be all kinds of
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problems and breaking changes down the line.</p>
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<p>Having said that, the Erlang VM is extremely mature and well tested, and if
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you decide to move away from Gleam the language you can compile your code to
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Erlang and maintain that in future.</p>
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<h2><a class="header" href="#is-it-good" id="is-it-good">Is it good?</a></h2>
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<p>Yes, I think so. :)</p>
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