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monoid

v0.2.0

Published

Simple monoid factory in JavaScript.

Downloads

21

Readme

Monoid

Build Status Coverage Status

Simple monoid factory in JavaScript. Compatible with the Fantasy Land JS Spec.

Easily define list reductions by providing an identity value and a binary function. Get a free way to reduce a list of monoids with concatAll.

Examples

Make a monoid and concat two monoid values.

var M = require('monoid');

var Any = M.Monoid({
  identity : false,
  binary   : function (v1, v2) {
    return v1 || v2;
  }
});


// Use the monoid instance method
Any(true).append(Any(false));    // => Any(true)

// Or the free function provided by the Monoid module
M.append(Any(true), Any(false)); // => Any(true)

// Reduce an entire list of monoids
M.concatAll([Any(false), Any(false), Any(true)]);  // => Any(true)
M.concatAll([Any(false), Any(false), Any(false)]); // => Any(false)

Create a function to reduce a list of values using applyWith.

var any = M.applyWith(Any);

any([false, false, true]);  // => true
any([false, false, false]); // => true


var Product = M.Monoid({
  identity : 1,
  binary   : function (v1, v2) {
    return v1 * v2;
  }
});

M.applyWith(Product, [3, 5, 10]); // => 150

Note: M.applyWith(<Monoid>, list) is equivelent to M.extract(M.concatAll(list.map(<Monoid>))).

Use shorthand syntax for defining binaries. Currently available for +, *, || and &&.

var Sum = M.Monoid({
  identity : 0,
  binary   : '+'
});

var sum = M.applyWith(Sum);

sum([10, 32, 11]) // => 53

TODO

  • More examples/docs
  • Add more built in binaries
  • Consider additional shorthand var Any = M.Monoid(false, '||').