Decision Workspace
expr-solver vs lexper vs fastexpr-rs
Side-by-side comparison of Rust crates
45
expr-solver
growingv1.0.6
Solves a mathematical expression while following precedence and associativity.
46
lexper
experimentalv0.0.3
A simple CLI calculator with a handwritten lexer and parser in Rust.
44
fastexpr-rs
growingv1.0.2
A tiny, fast Javascript expression parser
Core Metrics
| expr-solver | lexper | fastexpr-rs | |
|---|---|---|---|
| Health Score | 45 | 46 | 44 |
| Total Downloads | 6.2K | 1.2K | 3.4K |
| 30d Downloads | 4 | 5 | 5 |
| Dependents | 0 | 0 | 0 |
| Releases | 5 | 3 | 3 |
| Last Updated | 776d ago | 268d ago | 605d ago |
| Age | 2y 1m | 9m | 1y 8m |
Health Breakdown
expr-solver
Maintenance
10
Quality
14
Community
6
Popularity
5
Documentation
10
lexper
Maintenance
10
Quality
15
Community
6
Popularity
4
Documentation
11
fastexpr-rs
Maintenance
5
Quality
19
Community
6
Popularity
4
Documentation
10
Technical Details
| expr-solver | lexper | fastexpr-rs | |
|---|---|---|---|
| Version | 1.0.6 | 0.0.3 | 1.0.2 |
| Stable (≥1.0) | ✓ Yes | ✗ No | ✓ Yes |
| License | MIT | non-standard | MIT |
| Dependencies | 1 | 0 | 3 |
| Crate Size | 8KB | 8KB | 17KB |
| Features | 0 | 0 | 0 |
| Yanked % | 80.0% | 0.0% | 0.0% |
| Edition | 2021 | 2024 | 2021 |
| MSRV | — | — | — |
| Owners | 1 | 1 | 1 |
Links
Quick Verdict
- •lexper leads with a health score of 46/100, but none of the options score above 80.
- •expr-solver has the most downloads (6.2K), suggesting wider adoption.
- •⚠ expr-solver, fastexpr-rs have not been updated in over a year.
- •lexper is pre-1.0 — API may change.