Crate dactyl

Dactyl

This crate provides a fast interface to “stringify” unsigned integers, formatted with commas at each thousand. It prioritizes speed and simplicity over configurability.

If your application just wants to turn 1010 into "1,010", Dactyl is a great choice. If your application requires locale awareness or other options, something like num-format would probably make more sense.

Similar to itoa, Dactyl writes ASCII conversions to a temporary buffer, but does so using fixed arrays sized for each type’s maximum value, minimizing the allocation overhead for, say, tiny little u8s.

Each type has its own struct, each of which works exactly the same way:

• NiceU8
• NiceU16
• NiceU32
• NiceU64

(Note: support for usize values is folded into NiceU64.)

The intended use case is to simply call the appropriate from() for the type, then use either the as_str() or as_bytes() struct methods to retrieve the output in the desired format. Each struct also implements traits like Deref, Display, AsRef<str>, AsRef<[u8]>, etc., if you prefer those.

use dactyl::NiceU16;

assert_eq!(NiceU16::from(11234_u16).as_str(), "11,234");
assert_eq!(NiceU16::from(11234_u16).as_bytes(), b"11,234");

This crate also contains two “in development” structs — NicePercent and NiceElapsed — that can be useful for formatting percentages and durations, however their implementations are subject to change and they might eventually be split off into their own crates.

Modules

traits

Dactyl: Traits

Structs

NiceElapsed

This is a very simple struct for efficiently converting a given number of seconds (u32) into a nice, human-readable Oxford-joined byte string, like 3 hours, 2 minutes, and 1 second.

NicePercent

NicePercent provides a quick way to convert an f32 or f64 into a formatted byte string for e.g. printing.

NiceU8

NiceU8 provides a quick way to convert a u8 into a formatted byte string for e.g. printing.

NiceU16

NiceU16 provides a quick way to convert a u16 into a formatted byte string for e.g. printing. Commas are added for every thousand.

NiceU32

NiceU32 provides a quick way to convert a u32 into a formatted byte string for e.g. printing. Commas are added for every thousand.

NiceU64

NiceU64 provides a quick way to convert a u64 into a formatted byte string for e.g. printing. Commas are added for every thousand.

Functions

div_mod_u8

Floored Div/Mod.

div_mod_u16

Floored Div/Mod.

div_mod_u32

Floored Div/Mod.

div_mod_u64

Floored Div/Mod.

div_mod_u128

Floored Div/Mod.

div_mod_usize

Floored Div/Mod.

int_div_float

Integer to Float Division.

write_time^⚠

Write Time.

write_u8^⚠

Write u8.