Rohit Sachdeva

#Golang #Go #Ziglang #Zig #Rustlang #Rust Senior Backend & Systems Software Engineer

[Rohit Sachdeva @_r_sachdeva]

sync.Once's .Do and sync.OnceFunc both take func() — no return.
So the result has to live somewhere: a separate struct field you write to as a side effect.

sync.OnceValue takes func() T — the return value IS the cache. No extra field.

#golang #concurrency

[Rohit Sachdeva @_r_sachdeva]

time.After(d): Concurrency tool. Sets up a background timer and returns a channel.

t.After(u): Date/time method. Instant boolean comparison to check if timestamp t occurs after timestamp u.

#Golang time package

[Rohit Sachdeva @_r_sachdeva]

Go proverb: “errors are values” means “errors are values that implement the `error` interface.”

#Golang

[Rohit Sachdeva @_r_sachdeva]

Zig 0.16.0 has just released.

https://t.co/86Qk0G5pNA
#Ziglang

[Rohit Sachdeva @_r_sachdeva]

Go's time package has two sides:
date/time handling
Timer-based concurrency tools:

time.NewTimer(d)
timer.Stop()
timer.Reset(d)
time.After(d)
time.AfterFunc(d, f)
time.NewTicker(d)
ticker.Stop()
time.Tick(d)

#golang #concurrency

[Rohit Sachdeva @_r_sachdeva]

Go goroutine stack dumps show a bracketed state like [chan send] or [chan receive]: that means blocked. The full list lives in src/runtime/runtime2.go as waitReason constants. Not documented anywhere else. #golang
https://t.co/9aTetrDHIo

[Rohit Sachdeva @_r_sachdeva]

@sskras @ziglang Zig forces explicit allocation awareness, so when Go handles it automatically, it is more noticeable.

[Rohit Sachdeva @_r_sachdeva]

It’s great to see the #golang compiler using stack allocations to kill those noisy 1, 2, and 4-item heap allocations—even for escaping slices.
Optimized performance, automatically. https://t.co/6JmOjKBgG9
become allocation aware #ziglang

[Rohit Sachdeva @_r_sachdeva]

Check out the official list of Go replacements: https://t.co/BuA1CMpNSH
From Go 1.26+, `go fix` helps you with each of these replacements automatically! #golang

[Rohit Sachdeva @_r_sachdeva]

#golang
• for {} — Header omission = true.
• switch {} — Header omission = true (if/else chain).
#ziglang
• while (true) {} — Header requires explicit true.
• if / else — Standard conditionals; switch requires expression.

[Rohit Sachdeva @_r_sachdeva]

Catch compile time errors in your comptime assertion blocks in tests, skip runtime test execution: `zig test --test-no-exec <file.zig>` #ZigLang #Zig

[Rohit Sachdeva @_r_sachdeva]

-freference-trace[=num]: How many lines of reference trace should be shown per compile error—handy for getting more context without noisy output.
#ziglang often tells you “references hidden; use -freference-trace=…” in the error message. #zig

[Rohit Sachdeva @_r_sachdeva]

#ziglang

[Loris Cro ⚡ @croloris]

Simplistic Comptime Column Safety in SQLite Queries

https://t.co/5UT8RwH0xa

[Rohit Sachdeva @_r_sachdeva]

Interesting historical context on the Ruby YJIT port discussion 4 years ago.

https://t.co/CaddBdFPji Search 'Zig'

#ZigLang

[Rohit Sachdeva @_r_sachdeva]

looks like it has been announced: https://t.co/PitdLKccpI

[Carl Lerche @carllerche]

It probably is time for TokioConf... huh.

[Rust Language @rustlang]

Rust 1.85.0 has been released! 🌈🦀✨

Not only does this release add async closures, it also includes a whole new Rust Edition, Rust 2024! 🎆🚀

Check out the blog post for an overview of all the changes and additions: https://t.co/kaVFfLAhRZ

[Rohit Sachdeva @_r_sachdeva]

Track #Rust releases from:

https://t.co/jsNJiOMBmB

https://t.co/HreO3ytvh1

https://t.co/c9oT0scGjo

#Rustlang

[Rohit Sachdeva @_r_sachdeva]

An async function, when called, returns a Future because the Future is return type. This is just returning its return type like any regular function. The only change is Future wraps the declared return type in async function, to make the full return. #asyncrust

[Rohit Sachdeva @_r_sachdeva]

Rust Range Counting:
(low..=high).count() vs
(high-low) + 1
Both are equally fast - Range's count() uses optimized arithmetic under the hood. No iteration one by one in count. Calculates the number of steps between start and end using Step::steps_between!

#Rust #Rustlang

[Rohit Sachdeva @_r_sachdeva]

match some_string.as_str() {
"hello" => println!("Found hello"),
_ => println!("Something else")
}

Pattern Match:
https://t.co/vBSFmdmur2 shows String literals which are of &str type, not String. You can directly use "hello" but not "hello".to_string().

#rust #rustlang