Neva is a new kind of programming language where instead of writing step-by-step instructions, you create networks where data flows between nodes as immutable messages, with everything running in parallel by default. After type-checking, your program is compiled into machine code and can be distributed as a single executable with zero dependencies.
It excels at stream processing and concurrency while remaining simple and enjoyable for general development. Future updates will add visual programming and Go interop to enable gradual adoption.
What's Changed?
This release extends standard library with new errors package plus contains some minor fixes for documentations (thanks our community). No backward incompatible changes so far.
errors package
New stdlib package errors added with 3 public components:
def New(data string) (res error)- creates a new error with the given text.def Must<T, Y>(data T) (res Y)- converts a node that has an error outport to one that doesn't. It handles the error internally by panicking.def Lift<T, Y>(data T) (res Y, err error)- converts a node that doesn't have an error outport to one that does. The error outport is fictional and will always be silent.
Example - Lift
// errors.Lift wraps handler so it behaves like a node with error outport.
def Main(start any) (stop any) {
lift errors.Lift<any, any>{Handler}
panic Panic
---
:start -> lift
lift:res -> :stop
lift:err -> panic
}
// Handler doesn't have error outport.
def Handler(data any) (res any) {
println fmt.Println<any>
---
:data -> '42' -> println -> :res
}
Example - Must
// errors.Must wraps handler so it behaves like a node without error outport.
def Main(start any) (stop any) {
println fmt.Println<any>
must_handle errors.Must<any, any>{Handler}
---
:start -> 'create_me.txt' -> must_handle -> 'success!' -> println -> :stop
}
// Handler have error outport.
def Handler(data string) (res any, err error) {
write_all io.WriteAll?
---
:data -> write_all:filename
'Hello, io.WriteAll!' -> write_all:data
write_all -> :res
}
Other Changes
- Update tutorial.md by @WoodyAtHome in #851
- docs: update
constants.mdby @eltociear in #852 - Update README.md by @emil14 in #858
New Contributors
- @WoodyAtHome made their first contribution in #851
- @eltociear made their first contribution in #852
Full Changelog: v0.30.2...v0.31.0
Important
This is an ambitious project maintained by a small group of enthusiasts. Your support by joining us will show interest and motivate us to continue.
Also, please give us a star ⭐️ to increase our chances of getting into GitHub's trending repositories and tell your friends about the project. The more attention Nevalang gets, the higher our chances of actually making a difference!
