dtao/lazy.js

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

5966 stars · 258 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Lazy.js is a functional utility library for JavaScript, similar to Underscore and Lodash, but built on a lazy evaluation engine that avoids creating intermediate arrays. It supports chaining map/filter/reduce-style operations over arrays, objects, strings, and async sequences with minimal work.

Use cases

• process large arrays without creating intermediate arrays
• chain map/filter/take operations efficiently
• search-as-you-type over big datasets with early termination
• replace Underscore/Lodash for performance-critical iteration
• iterate over strings and objects lazily
• asynchronous sequence iteration

When to choose

• you need Underscore/Lodash-style chaining but with better performance on large collections
• you want lazy evaluation with early exit (take, find) to avoid unnecessary computation
• you need a dependency-free functional utility library

When to avoid

• you need a actively maintained library with modern ES support - last release was 2020
• your datasets are small and Lodash performance is sufficient
• you need async iteration features beyond basic AsyncSequence support

Facets

library · maturity maintenance

serialization developer-tools developer-tools performance browser cross-platform lazy-evaluation functional-programming underscore-alternative lodash-alternative sequences algorithms nodejs

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