@thi.ng/transducers

# Change Log - **Last updated**: 2025-08-04T09:13:01Z - **Generator**: [thi.ng/monopub](https://thi.ng/monopub) All notable changes to this project will be documented in this file. Only versions published since **2022-01-01** are listed here. Please consult the Git history for older version information. See [Conventional Commits](https://conventionalcommits.org/) for commit guidelines. **Note:** Unlisted _patch_ versions only involve non-code or otherwise excluded changes and/or version bumps of transitive dependencies. ## [9.6.0](https://github.com/thi-ng/umbrella/tree/@thi.ng/transducers@9.6.0) (2025-07-13) #### 🚀 Features - add result caching for `step()` ([101760b](https://github.com/thi-ng/umbrella/commit/101760b)) - update `StepFn` type, add `IDeref` support - update `step()` to cache most recent result (can be disabled) #### ♻️ Refactoring - minor update `multiplex()` ([d2cae35](https://github.com/thi-ng/umbrella/commit/d2cae35)) - disable result caching for internal`step()` usage to reduce RAM usage ## [9.5.0](https://github.com/thi-ng/umbrella/tree/@thi.ng/transducers@9.5.0) (2025-07-09) #### 🚀 Features - add `StepFn` function type ([f1fc685](https://github.com/thi-ng/umbrella/commit/f1fc685)) ## [9.4.0](https://github.com/thi-ng/umbrella/tree/@thi.ng/transducers@9.4.0) (2025-06-09) #### 🚀 Features - add join() transducer ([3bbc88d](https://github.com/thi-ng/umbrella/commit/3bbc88d)) ### [9.3.1](https://github.com/thi-ng/umbrella/tree/@thi.ng/transducers@9.3.1) (2025-05-28) #### 🩹 Bug fixes - fix [#500](https://github.com/thi-ng/umbrella/issues/500), update initial timestamp handling in `throttleTime()` ([6a8d88e](https://github.com/thi-ng/umbrella/commit/6a8d88e)) ## [9.3.0](https://github.com/thi-ng/umbrella/tree/@thi.ng/transducers@9.3.0) (2025-04-30) #### 🚀 Features - add `binned()` transducer & example ([6e8d9cd](https://github.com/thi-ng/umbrella/commit/6e8d9cd)) ### [9.2.13](https://github.com/thi-ng/umbrella/tree/@thi.ng/transducers@9.2.13) (2025-01-14) #### ♻️ Refactoring - use optional chaining & nullish coalescing ([c5a0a13](https://github.com/thi-ng/umbrella/commit/c5a0a13)) ### [9.2.11](https://github.com/thi-ng/umbrella/tree/@thi.ng/transducers@9.2.11) (2024-12-27) #### ♻️ Refactoring - update time-based transducers ([54ad446](https://github.com/thi-ng/umbrella/commit/54ad446)) - add [@thi.ng/timestamp](https://github.com/thi-ng/umbrella/tree/main/packages/timestamp) micro dependency - update timestamp handling (more precise in some contexts) - update `benchmark()`, `partitionTime()`, `throttleTime()` ## [9.2.0](https://github.com/thi-ng/umbrella/tree/@thi.ng/transducers@9.2.0) (2024-08-19) #### 🚀 Features - add syncTuples() transducer ([d3b77bd](https://github.com/thi-ng/umbrella/commit/d3b77bd)) ## [9.1.0](https://github.com/thi-ng/umbrella/tree/@thi.ng/transducers@9.1.0) (2024-08-13) #### 🚀 Features - add sortedFrequencies() reducer ([1257a79](https://github.com/thi-ng/umbrella/commit/1257a79)) - add pushKeys() reducer ([f19d152](https://github.com/thi-ng/umbrella/commit/f19d152)) ### [9.0.6](https://github.com/thi-ng/umbrella/tree/@thi.ng/transducers@9.0.6) (2024-06-21) #### ♻️ Refactoring - rename various rest args to be more semantically meaningful ([8088a56](https://github.com/thi-ng/umbrella/commit/8088a56)) - enforce uniform naming convention of internal functions ([56992b2](https://github.com/thi-ng/umbrella/commit/56992b2)) - dedupe min/maxCompare() impls, add tests ([22fc6e3](https://github.com/thi-ng/umbrella/commit/22fc6e3)) ### [9.0.2](https://github.com/thi-ng/umbrella/tree/@thi.ng/transducers@9.0.2) (2024-04-20) #### ♻️ Refactoring - update type usage ([b0e87ab](https://github.com/thi-ng/umbrella/commit/b0e87ab)) # [9.0.0](https://github.com/thi-ng/umbrella/tree/@thi.ng/transducers@9.0.0) (2024-04-08) #### 🛑 Breaking changes - update Reducer, Transducer and other types ([95c43f3](https://github.com/thi-ng/umbrella/commit/95c43f3)) - BREAKING CHANGE: update generics in Reducer, Transducer and other types - swap generic type args in `Reducer` and `IReducible` to be same order as in `Transducer`, `IXform`, i.e. `Reducer<A, B>` maps items from type A to type B, **not** the other way (as was)! - this new order is more logical, less confusing and also in line with upcoming async transducers pkg - changes in userland should be minimal (if any), only impacted are custom reducer definitions - update all pkg internal occurrences - various other small refactorings, type/arg updates, e.g. - add generics for `reduced()`/`ensureReduced()`/`unreduced()` - update `step()` return type (incl. undefined) - add `StructField` generics ### [8.9.6](https://github.com/thi-ng/umbrella/tree/@thi.ng/transducers@8.9.6) (2024-02-22) #### ♻️ Refactoring - update object destructuring in all pkgs & examples ([f36aeb0](https://github.com/thi-ng/umbrella/commit/f36aeb0)) ### [8.9.5](https://github.com/thi-ng/umbrella/tree/@thi.ng/transducers@8.9.5) (2024-02-22) #### ♻️ Refactoring - update all `node:*` imports ([c71a526](https://github.com/thi-ng/umbrella/commit/c71a526)) ## [8.9.0](https://github.com/thi-ng/umbrella/tree/@thi.ng/transducers@8.9.0) (2024-02-06) #### 🚀 Features - update normRange(), add reverse order ([c7e7fef](https://github.com/thi-ng/umbrella/commit/c7e7fef)) - add optional arg to reverse order of normRange() - update docstrings/examples ### [8.8.9](https://github.com/thi-ng/umbrella/tree/@thi.ng/transducers@8.8.9) (2023-11-09) #### ♻️ Refactoring - update all tests (packages T-Z) ([020ef6c](https://github.com/thi-ng/umbrella/commit/020ef6c)) ### [8.8.7](https://github.com/thi-ng/umbrella/tree/@thi.ng/transducers@8.8.7) (2023-10-30) #### 🩹 Bug fixes - fix flatten1() arg types, update docs ([b7ae8eb](https://github.com/thi-ng/umbrella/commit/b7ae8eb)) ## [8.8.0](https://github.com/thi-ng/umbrella/tree/@thi.ng/transducers@8.8.0) (2023-10-11) #### 🚀 Features - add repeatedly2d/3d() iterators ([5057939](https://github.com/thi-ng/umbrella/commit/5057939)) - add consume() helper fn ([e612846](https://github.com/thi-ng/umbrella/commit/e612846)) ## [8.7.0](https://github.com/thi-ng/umbrella/tree/@thi.ng/transducers@8.7.0) (2023-09-15) #### 🚀 Features - update rename()/renamer() ([221b13e](https://github.com/thi-ng/umbrella/commit/221b13e)) - add support for retaining keys ## [8.6.0](https://github.com/thi-ng/umbrella/tree/@thi.ng/transducers@8.6.0) (2023-08-22) #### 🚀 Features - add length() transducer ([47a95b7](https://github.com/thi-ng/umbrella/commit/47a95b7)) ### [8.5.3](https://github.com/thi-ng/umbrella/tree/@thi.ng/transducers@8.5.3) (2023-08-12) #### ♻️ Refactoring - update .probability() call sites in various pkgs ([c8c8141](https://github.com/thi-ng/umbrella/commit/c8c8141)) ## [8.5.0](https://github.com/thi-ng/umbrella/tree/@thi.ng/transducers@8.5.0) (2023-08-04) #### 🚀 Features - fix [#401](https://github.com/thi-ng/umbrella/issues/401), update multiplex(), step() ([834b076](https://github.com/thi-ng/umbrella/commit/834b076)) - add optional support to override single-result unwrapping behavior - update docstrings/examples - add tests #### ♻️ Refactoring - update `identity` usage in various pkgs ([b6db053](https://github.com/thi-ng/umbrella/commit/b6db053)) - minor internal updates ([5ffdcbb](https://github.com/thi-ng/umbrella/commit/5ffdcbb)) ## [8.4.0](https://github.com/thi-ng/umbrella/tree/@thi.ng/transducers@8.4.0) (2023-03-19) #### 🚀 Features - add flatten1() transducer ([2ffd476](https://github.com/thi-ng/umbrella/commit/2ffd476)) - syntax sugar for a common mapcat() usecase ## [8.3.0](https://github.com/thi-ng/umbrella/tree/@thi.ng/transducers@8.3.0) (2022-03-11) #### 🚀 Features - add mapA() helper ([5cc5795](https://github.com/thi-ng/umbrella/commit/5cc5795))