1
Active recall passive reading
It is easy to feel like you understand Rust while reading tutorial. It is harder, and more useful, to apply the information immediately
Rust practice that forces active recall
Stop watching Rust tutorials. Make Rust stick by writing 1,000 lines.
RareCode gives you 700+ structured Rust exercises designed to build fluency through repetition, active recall, and real code submissions.
43 exercises free No credit card required Built for working developers
rarecode.ai/problems/680bbbf11e2be363c5924660
Ownership18 / 43 free
Borrow a string without taking ownership
Complete the function so it returns the length of a value without moving it. The original value should still be usable after the function call.
- Use a shared reference.
- Keep the original String valid.
- Pass all included tests.
EditorConsole OutputTests
RunTestSubmit
// Complete the function
fn string_length(s: &String) -> usize {
s.len()
}
fn main() {
let name = String::from("RareCode");
let len = string_length(&name);
println!("{name} has {len} chars");
}All tests passing
The original String remains valid after the function call.
VIMNORMAL
700+
structured Rust exercises
1,000+
lines of Rust practice
43
free exercises to start
The core problem
Rust does not click from passive learning.
Passive learning without RareCode:
- Bouncing between docs and tutorials
- Unfinished projects
- Studying without an explicit goal
- Constantly forgetting what you read
- Ultimately wasting time
rarecode.ai/problems/680bbbf11e2be363c5924660
Ownership18 / 43 free
Borrow a string without taking ownership
Complete the function so it returns the length of a value without moving it. The original value should still be usable after the function call.
- Use a shared reference.
- Keep the original String valid.
- Pass all included tests.
EditorConsole OutputTests
RunTestSubmit
// Complete the function
fn string_length(s: &String) -> usize {
s.len()
}
fn main() {
let name = String::from("RareCode");
let len = string_length(&name);
println!("{name} has {len} chars");
}All tests passing
The original String remains valid after the function call.
VIMNORMAL
The product
Every exercise makes you write code.
- No passive lessons.
- No vague build-an-app assignments.
- Just focused Rust practice, one concept at a time.
- Reinforce concepts through repeated exposure instead of one-off explanations.
- Track progress as you work toward 1,000+ lines of submitted Rust.
- Start with free exercises before deciding whether to unlock the full path.
The mechanism
Why this works
RareCode is built around the thing most Rust learners avoid for too long: repeated code production.
2
Small exercises reduce friction
Large projects create too many unknowns at once. RareCode keeps each task narrow so you can isolate one Rust concept.
3
Repetition builds fluency
Nobody remembers concepts the first time they encounter they. Concepts must be shown several times in different settings.
Integrated Repetition
Keep revisiting what you learned
- Move through Rust in a sequence that builds on itself.
- Whenever we introduce a concept, we tie it back to what you learned
- Stop the learn-and-forget cycle
01Variables, types, and control flow
02Loops
03Vectors
04Vectors with Loops and control flow
05Ownership
06Ownership with vectors, loops, and control flow
07Typecasting and vectors and control flow
08Introduction to sets
09Sets and vectors used together
10...
Real reviews on X
Developers are finishing real Rust practice
Unsolicited feedback from developers who posted publicly about RareCode.
Generous Free Tier
Start free. Upgrade only when the practice is useful.
Try the first 43 exercises without a credit card. Unlock the full Rust path with one payment.
Free start
$0
No credit card required
- 43 Rust exercises
- Immediate access
- Enough practice to judge the format
Full Rust path
$39.99
6 months access. One-time payment.
- 700+ structured exercises
- 1,000+ lines of Rust practice
- No recurring subscription
Questions before you start
FAQ
Do I need Rust experience?
No, but we expect you to know another programming language already.
Is this a video course?
No. RareCode is exercise-first. The point is to spend more time writing Rust than watching someone else write Rust.
What happens after I click start?
You go directly into the Rust exercise path and can begin with the free exercises.
Can I try it before paying?
Yes. The first 43 exercises are free and do not require a credit card.
Is this enough to become a Rust expert?
No single exercise path makes someone an expert. RareCode is designed to build fluency with Rust fundamentals and intermediate patterns.
Start now
Write your first Rust exercise now.
Start free, build momentum, and work toward 1,000 lines of Rust practice.
43 exercises free No credit card required