fn-proxy

fn-proxy

Simple function proxying. Allows for point-free recursion in JavaScrpipt, and simulation of lazy function evaluation.

Install

$ npm install fn-proxy

Run the specs (make sure jasmine-node is installed)

$ npm test

Usage

Require the module

var proxy = require('fn-proxy');

Examples

All examples show a point free recursive strategy for finding the length of a list. This would normally not be possible with regular JavaScript. Also note: examples use point-free style functions, something like ramda or lodash would provide.

• Explicit proxy - save proxy after declaration

var length = ifElse(isEmpty, always(0), compose(inc, proxy('length'), tail));

proxy('length', length);

length([]) // => 0
length([1, 2, 3, 4]) // => 4

• Short-hand proxy chaining

var length = ifElse(
  isEmpty, always(0), compose(inc, proxy('length'), tail)
).proxy('length');

length([]) // => 0
length([1, 2, 3, 4]) // => 4

• Wrap declaration with proxy

var length = proxy('length', ifElse(
  isEmpty, always(0), compose(inc, proxy('length'), tail)
));

length([]) // => 0
length([1, 2, 3, 4]) // => 4

• Invoke the proxy directly

proxy('length', ifElse(isEmpty, always(0), compose(inc, proxy('length'), tail)));

proxy('length')([]) // => 0
proxy('length')([1, 2, 3, 4]) // => 4