Package Exports

lenses

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Readme

lenses.js

Functional lenses that compose and stuff

require('./src/lenses').expose(global);
var compose = require('./src/lib/pointfree').compose;

// setup an easy test fn
var toUpperCase = function(x) { return x.toUpperCase(); };

// here's the data structure
var user = {name: "Bob", addresses: [{street: '99 Maple', zip: 94004, type: 'home'}, {street: '2302 Powell', zip: 94001, type: 'work'}]}

// make some lenses
var L = makeLenses(['name', 'addresses', 'street']);

// compose the lenses
var secondAddressesStreet = compose(L.addresses, L._num(2), L.street)

// mess with the user
over(secondAddressesStreet, toUpperCase, user) // { name: 'Bob', addresses: [ { street: '99 Maple', zip: 94004, type: 'home' }, { street: '2302 POWELL', zip: 94001, type: 'work' } ] }

view(L.name, user) // 'Bob'

set(L.name, 'Kelly', user) // {name: "Kelly", addresses: [{street: '99 Maple', zip: 94004, type: 'home'}, {street: '2302 Powell', zip: 94001, type: 'work'}]}

ROADMAP:

remove dependency on identity and const from pointfree and use fantasy ones
update the browser file for amd as well
add traverses and folds
more combinators
prisms
this list is getting long...