背景用Node.js开发App服务端Api.框架:Express,Promise库:bluebird. 局限我没用过ES7的await,async语法,所以无法比较.另外,bluebird也了解的不详细,如有写的不对的地方,实属正常,欢迎讨论. 惊喜出现的过程从callback到async开始只用Node的传统callback嵌套方װ ...

来源:Clojure for the brave and true 什么是Programming to Abstractions?是一种设计函数库的原则,Clojure采用了这种原则.即把具有相似特征的数据结构抽象成某个概念,比如sequence.之后这些类的数据都可以用同一个函数操作. 类似的东西Javascript的Lodash库v ...

重点一FP的核心是组合,一些比较难懂的概念(比如monad), functor),都是为了强化FP的组合功能. 重点二FP非常有利于实现OpenClose原则,既Open to extension, close to modification. 重点三Javascript的Promise是一种monad.

has_many through requires a join model name your join table anything ex: memberships Pros: more flexible, can add additional attributes(solumns) to join tableCons: additional join model required has_and_belongs_to_many no join model necesary assumes join table based on convention ex: groups_users Pors: easier, no join model Cons: not as flexible, can’t add additional attributes(solumns) to join table

Managed Google App Engine Heroku cons: no server access, constrained enviroment pros: don’t need devops skills Self Service VPS pros: your own virtualized environment/server cons: need devop/sysadmin skills AWS, Rackspace, Digital Ocean, Linode Physical Machines colocation Shared host your app in a dir, other apps in other dir roomates pro: very cheap cons: too many to list Vendors Dreamhost

HTTP: Request verb/method (GET or POST) url parameters Response status code (200, 301, 404, 500) payload Stateless: we have to rebuild the world at every request. MVC: Model, View, Controller Controller routes to appropriate action based on request action my talk to model, and then either redirect (301) or render view (200) as the response Important Sinatra concepts: Rendering template allows access by template to ivars set up in action Template have access seeeion hash session params

juggle many layers of technologies, all with different syntax & behaviors, and understand how they integrate with each otherOther things web developers must be aware of: best practices security concerns browser compatibility mobile operating systems FrontEnd Javascript frameworks jquery … MVC backbone.js Ember.js … ajax coffeesript HTML erb haml … CSS sass … mobile responsive MiddleWare APIs URLs REST request/response processing security xss, crsf, code injection, etc BackEnd database relational MySql Postgres NoSql document MangoDB web services REST SOAP MISC deployment background processing git bundler ...

build mock up build domain model build relation DB that support all business logic build url points, control actions, template

class Animal attr_accessor :name def initialize(name) @name = name end def speak "#{ name } is speaking!" end end class Dog < Animal def speak "#{ name } is barking!" end end class Cat < Animal end fido = Dog.new('fido') puts fido.name puts fido.speak kitty = Cat.new('kitty') puts kitty.name puts kitty.speak puts Dog.ancestors produce fido fido is barking! kitty kitty is speaking! Dog Animal Object Kernel BasicObject

module Swimmable def swim "#{ name } is swimming!" end end module Fetchable def fetch "#{ name } is fetching!" end end class Animal attr_accessor :name def initialize(name) @name = name end def speak "#{ name } is speaking!" end end class Mammal < Animal def warm_blooded? true end end class Dog < Mammal include Swimmable include Fetchable def speak "#{ name } is barking!" end end fido = Dog.new('fido') puts fido.swim produce fido is swimming! Dog Fetchable Swimmable Mammal Animal Object Kernel BasicObject