Crate abtestify 

Deterministic A/B test bucketing.

get_bucket hashes experiment_name:unique_id with SHA-256 and maps it to one of 10,000 buckets, so a user always gets the same variant within an experiment and independent variants across experiments. Raising exposure only adds users; it never moves anyone between variants.

Assignments are byte-for-byte identical to the abtestify npm package and the Go, Python, Java/Kotlin and Swift ports. Shared test vectors in the repository enforce it. The crate has no dependencies.

use abtestify::{get_bucket, Params};

let assignment = get_bucket(&Params::new("checkout-cta", "user-5")).unwrap();
assert_eq!(assignment.resolved_variant, "treatment");

let ramp = Params::new("checkout-cta", "user-5")
    .treatment_split(20.0)
    .exposure(10.0);
println!("{}", get_bucket(&ramp)?.resolved_variant);

Structs

Assignment

The variant a user is assigned to.

Params

Input for get_bucket.

Enums

Error

Invalid input to get_bucket. Fields are checked in declaration order.

Constants

BUCKETS

Number of buckets users are spread across.

Functions

get_bucket

Assigns params.unique_id to a variant of params.experiment_name.