lodash-fp-composition example

example.js

// BABEL/BROWSER import:
//    import _ from lodash
//    import {flow,when,error,lensOver,log,either,maybe} from lodash-fp-composition
//
// NODEJS import:
//    var _ = require('lodash')
//    _.mixin( require('lodash-fp-composition') )

engine                   = {
                             inited:false,
                             user: false
                           }

engine.isInited          = _.get('user')
                                 
engine.isNotInited       = _.negate( engine.isInited )

engine.getUser           = fetch("/user/current",{method:"get"})      // =promise

engine.createUser        = fetch("/user",        {method:"post"})     // =promise

engine.getOrCreateUser   = _.flow(
                               _.either( engine.getUser, engine.createUser ),
                               _.maybe( _.log("user ok") )
                           )

engine.init              = _.flow(
                               _.when( getOrCreateUser,     _.lensOver( 'user', getOrCreateUser ) ),
                               _.when( engine.isInited,     _.lensOver('inited', => true) ),
                               _.when( engine.isNotInited,  _.error("something went wrong") ),
                           )

engine.init( _.clone(engine) )