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Gleam is cool. I wrote some services with it to see if I wanted to use it for more projects. It seemed like a good option because it would be easy to teach.
Things I like:
- fast build times (I only tested small apps though, under 2000 LOC)
- strong static types
- runs on the BEAM
- easy to learn
- pattern matching
- immutable + structural sharing
- currying (with parameter holes)
Things I don’t like:
- no re-exports
- it’s possible to have name collisions between packages; authors have a gentleman’s agreement to always create a top-level module with the same name as the package
- some standard library APIs seem missing or immature (it’s still pre-1.0)
- it can be hard to get good performance out of idiomatic code for specific tasks (see immutability)
- no format strings; best you can do is
"Hello, " <> name
. It starts to get cumbersome - parsing/serialization is all quite manual boilerplate; there’s nothing quite like
serde
- no field/argument punning
- no method syntax; you just have to scan the docs to figure out what functions can be used with a given type
- you can’t define the same variant name twice in the same module; I believe this is a limitation in how the types are translated to Erlang records
- you can’t call functions in pattern matching
if
guards - you can’t have dependency cycles between modules in the same package
- hard to write FFI correctly; you lose all the comfort of types
Apparently it’s hard to get hired in software. Meanwhile, some of the worst software ever made is being written today. Have you tried using literally any software recently? We’re in this “barely good enough to function while being heavily supplemented by tech support” phase. I guess capitalism breeds incompetence as long as it’s still profitable?