A functional JavaScript utility library with lazy evaluation for optimal performance and memory efficiency.
Lazy.js is a functional utility library for JavaScript that provides lazy evaluation of sequences, similar to Underscore and Lodash. It solves performance and memory issues by deferring computations until needed, avoiding intermediate arrays and unnecessary iterations. This makes it ideal for processing large datasets, infinite sequences, and event streams efficiently.
JavaScript developers working with data transformations, large arrays, or streams who need better performance and memory efficiency than standard utility libraries offer. It's also useful for developers handling DOM events or asynchronous sequences functionally.
Developers choose Lazy.js because it offers the familiar API of Underscore/Lodash with the performance of hand-written procedural code, thanks to its lazy engine. It uniquely supports indefinite sequences, asynchronous iteration, and event/stream processing without sacrificing expressiveness.
Like Underscore, but lazier
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Lazy evaluation defers computation until needed, eliminating intermediate arrays as shown in the search example with a people array, reducing memory overhead for chained transformations.
Can generate infinite sequences like random numbers or Fibonacci, enabling transformations without pre-computation, as demonstrated in the README with Math.random and Fibonacci examples.
Allows timed intervals between elements with the async method, useful for controlled iteration, like outputting characters with a 1-second delay.
Treats DOM events as sequences for functional operations like map and filter, shown in the mousemove example with coordinate mapping and filtering.
Splits strings or matches patterns lazily without creating full arrays, ideal for large text processing, as illustrated with taking the first five lines of a string.
The library is marked as experimental with API changes likely, especially for stream processing as noted in the README, making it risky for long-term projects.
Requires a separate file (lazy.browser.js) for DOM event handling, adding complexity and extra steps for frontend integration compared to all-in-one solutions.
Compared to Lodash, it has fewer features, plugins, and community contributions, which can limit customization and support for edge cases.
Lazy.js is an open-source alternative to the following products:
Lodash is a popular JavaScript utility library that provides consistent, modular functions for common programming tasks like array manipulation, object iteration, and function composition.
Underscore is a JavaScript utility library that provides functional programming helpers for working with arrays, objects, and functions.