lambdajs
A functional, curried, and pure reimplementation of the full ECMAScript API.
What is lambdajs?
LambdaJS is a functional programming library that reimplements the entire ECMAScript API as pure, curried functions with data-last parameters. It solves the problem of JavaScript's mutable and object-oriented built-in methods by providing immutable, composable alternatives that enable point-free style programming.
JavaScript developers interested in functional programming, immutability, and declarative code, particularly those building applications where side effects and mutation are concerns.
Developers choose LambdaJS for its strict adherence to functional principles—pure functions, automatic currying, and data-last parameters—which enhance code predictability, testability, and composability compared to native JavaScript methods.
Overview
LambdaJS provides a functional programming interface to the entire ECMAScript API, transforming native JavaScript methods into pure, curried functions with data-last parameters. This enables point-free style programming, eliminates side effects, and enhances composability.
Key Features
- Data-Last Parameters — Functions follow the pattern
method(arg, data)instead ofdata.method(arg), enabling easier partial application. - Automatic Currying — Every function is curried, allowing flexible partial application and composition.
- Pure Functions — All operations are side-effect free; for example,
reverse(array)returns a new array instead of mutating the original. - Split Optional Arguments — Functions with optional parameters are split into two variants (e.g.,
indexOfandindexOf_) for clarity and consistency. - Global Namespace Exposure — Includes an
expose()method to mix functions into the global scope for convenience.
Philosophy
LambdaJS embraces functional programming principles to make JavaScript's built-in API more predictable, composable, and free of side effects, promoting a declarative coding style.
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