Modules

Version 0: expect changes

While the crate is at version 0.x:

• The split into modules, and so into Cargo features, may change. A helper can move to another module — and so to another feature to enable — from one release to the next.
• The code and security verification will keep improving. More checks (fuzzing and static analysis, for instance) are planned, and each helper’s page says what it guarantees and what it does not.

Pin the exact version and read the changelog before upgrading.

The helpers4 crate is organised in 13 modules. Each module is a Cargo feature of the same name, and all of them are enabled by default (cargo add helpers4).

Install only what you use

Turn the default features off and name the modules you want:

cargo add helpers4 --no-default-features --features string,hex

or in Cargo.toml:

[dependencies]
helpers4 = { version = "0.0.5", default-features = false, features = ["string", "hex"] }

Modules

Module	Cargo feature	What it covers	Items
array	array	Helpers for slices and Vecs that the standard library does not provide.	13
cache	cache	Caches and stores whose entries expire.	2
duration	duration	Parsing and formatting of durations as short human-readable strings (1h30m).	3
env	env	Dotenv (.env) helpers working on plain text: no file or process-environment access, so they are deterministic and easy to test.	5
hex	hex	Hexadecimal encoding and decoding with typed errors.	6
http	http	HTTP header value helpers on plain text: no dependency on an HTTP crate.	1
iter	iter	Helpers for any Iterator, not only slices: work on a lazy, single-use or unbounded source.	3
map	map	Helpers for HashMap that the standard library does not provide.	3
net	net	Network helpers on std::net and plain text: no I/O, no resolution.	3
number	number	Numeric helpers that the standard library does not provide.	7
string	string	String manipulation and formatting helpers.	14
time	time	Time helpers.	3
validate	validate	Shape checks for common user-facing formats: pragmatic subsets that catch real mistakes, not full grammars.	3

Import through the module path (helpers4::string::capitalize): names can repeat across modules on purpose, so never glob-import a module.

Documented version: 0.0.5. Minimum supported Rust version: 1.85.