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once_map

v0.4.23 Growing

Single assignment and lazy maps

MIT OR Apache-2.0 Edition 2021 MSRV 1.65

Quick Verdict

  • !Pre-1.0: API may have breaking changes
  • โœ“Trusted by 153 crates
  • โœ“Permissive license (MIT OR Apache-2.0)

Security

Checking security advisories...
Downloads
789.6K
Dependents
153
Releases
29
Size
16KB

Deep Insights

๐Ÿ“Š
Stable downloads

67.3K downloads in the last 30 days (2.2K/day). Volume is roughly flat compared to the previous period.

๐Ÿ”—
Moderate adoption

153 crates depend on once_map. Reasonable ecosystem adoption, though not yet a core dependency.

๐Ÿ”ฌ
Pre-1.0 for over a year

Despite being 3+ years old, once_map hasn't reached 1.0 yet. Expect potential API changes between versions.

๐Ÿ“
Compact crate

At 16KB, once_map is lightweight. Small crate size correlates with focused, well-scoped functionality.

โš ๏ธ
Notable yanked versions

10% of releases have been yanked. Check version history before pinning.

๐ŸŒŸ
Used by top crates

Notable dependents include solar-interface, solar-sema, usc, bones_ecs, weev. When high-quality crates choose once_map, it's a strong quality signal.

Health Breakdown

Maintenance 11/25

Recency, release consistency, active ratio

Quality 13/25

Yanked ratio, deps, size, maturity, features

Community 12/20

Reverse deps, ownership, ecosystem

Popularity 7/15

Downloads, momentum, growth trend

Documentation 15/15

Docs, repo, license, metadata

Download Trend

Daily downloads ยท last 90 days
2K/day avg+64%
01K2K3K4K12/291/162/32/213/113/28

Top Dependents

Version Adoption

v0.4.21
38%
v0.4.23
22%
v0.4.19
19%
v0.4.18
14%
v0.4.22
7%

Release Timeline

29 releases3 yankedsince 2022
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2022
8
2023
11
2024
8
2025
2
2026
Less
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Yanked

Feature Flags

default =["std", "ahash"]

std*ahash*rayonserde

README

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Maintainers

Dependencies
7
direct dependencies
Dependents
153
crates depend on once_map

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