2017年读书 14 cards #328自控力 Dr Drop files to upload. Drop files to upload. #331利用Python进行数据分析 Drop files to upload. #334Scala函数式编程 Drop files to upload. #335HeadFirst Java Drop files to upload. #336代码大全 Code Complete Drop files to upload. #337啊哈!算法 Drop files to upload. #338什么是数学 Drop files to upload. #339Effective Javascript: 编写高质量JavaScript代码的68个有效方法 Drop files to upload. #340Python Cookbook Drop files to upload. #332新经济,新规则 Drop files to upload. #333福柯-牛津大学通识读本 Drop files to upload. #341知乎,聪明人系列 Drop files to upload. Add a card… L6中阶阶段 6 cards #319实际情况1/16 Drop files to upload. #320方向0/14 Drop files to upload. #321学习2/44 Drop files to upload. #322路径 Action1/2 Drop files to upload. #323需要关注什么 Focus13/29 Drop files to upload. #324GET24/24 Drop files to upload. Add a card… L6阶段Read:List 16 cards #327北大3/5 Drop files to upload. #306深入学习mongoDB11/13 Drop files to upload. #284深入浅出nodejs3/4 Drop files to upload. #285代码大全1/2 Drop files to upload. #286python高级编程 && 进行数据分析0/7 Drop files to upload. #288scala函数式编程0/1 Drop files to upload. #289集体智慧编程0/2 Drop files to upload. #298git book 0/5 Drop files to upload. #316算法 Drop files to upload. #292akka.io 6/6 Drop files to upload. #283scala初学者指南 26/26 Drop files to upload. #291DONE 练字1 1/1 Drop files to upload. #287DONE ES6阮一峰 2/2 Drop files to upload. #305DONE RESTful Web Services with Scala5/5 Drop files to upload. #317DONE 数学1/1 Drop files to upload. #312erlang1/1 Drop files to upload. Add a card… SkillStack6 Plus 10 cards #234本版块为S6进展受阻 拆分任务 Drop files to upload. #282L6是一次过渡阶段,如果能挺过L6,我应该真正意义上的开始靠向或称为工程师 Drop files to upload. #249Scala必须搞清楚的地方 32/36 Drop files to upload. #237Spark 1 0/1 Drop files to upload. #238Python中级进阶 1 Drop files to upload. #239Python科学计算 2 Drop files to upload. #236akka1 3/3 Drop files to upload. #250ss 花销 1061/1 Drop files to upload. #240JS 2 4/4 Drop files to upload. #235Done Scala基础语法要过关 已经走完一个教程 9/9 Drop files to upload. Add a card… Skil Stack Level 6 Update2 0620 11 cards #228akka1/5 Drop files to upload. #211Scala10/11 Drop files to upload. #207ReadList(Others)8/10 Drop files to upload. #202python中级进阶 2/7 Drop files to upload. #201python科学计算2/8 Drop files to upload. #204ES6 JSHero中级进阶6/8 Drop files to upload. #205PostCast0/3 Drop files to upload. #212Spark1/1 Drop files to upload. #214MongoDB高级运维5/5 Drop files to upload. #213阿里云4/4 Drop files to upload. #203Shell Script1/1 Drop files to upload. Add a card… L6的坑 24 cards #257及时是spark,说白了也是借用scala算子的一层封装 Drop files to upload. #258国内的sbt源很慢,搭建repox可以加速包依赖下载过程 Drop files to upload. #259g8是相当于express-generator一样的工具 Drop files to upload. #260scala参考资料档次参差不齐,最好的学习资料是先看csdn的中文版,知道一些语义后再去读官方文档,术语太多了。 Drop files to upload. #261已初阅 Scala 课堂! 不适合初学时候看, 适合总结的时候看,更像是笔记 Drop files to upload. #262http://www./archives/12 Drop files to upload. #269scala模式匹配是最实用的特性之一 Drop files to upload. #270这部分听得不太懂: 定义单例对象不是定义类型(在Scala的抽象层次上说)。如果只是ChecksumAccumulator 对象的定义,你就建不了 ChecksumAccumulator 类型的变量。宁愿这么说, ChecksumAccumulator 类型是由单例对象的伴生类定义的。然而,单例对象扩展了超类并 可以混入特质。由于每个单例对象都是超类的实例并混入了特质,你可以通过这些类型调 用它的方法,用这些类型的变量指代它,并把它传递给需要这些类型的方法。我们将在第 十二章展示一些继承自类和特质的单例对象的例子 Drop files to upload. #271不可变对象提供了若干强于可变对象的优点和一个潜在的缺点。首先,不可变对象常 常比可变对象更具逻辑性,因为它们没有随着时间而变化的复杂的状态空间。其次,你可 以很自由地传递不可变对象,而或许需要在把可变对象传递给其它代码之前,需要先建造 个以防万一的副本。第三,没有机会能让两个同时访问不可变对象的线程破坏它合理构造 的状态,因为根本没有线程可以改变不可变对象的状态。第四,不可变对象让哈希表键值 更安全。比方说,如果可变对象在被放进了 HashSet 之后被改变,那么你下一次查找这个 HashSet 就找不到这个对象了。 不可变对象唯一的缺点就是它们有时需要复制很大的对象图而可变对象的更新可以在 原地发生。有些情况下这会变得难以快速完成而可能产生性能瓶颈。结果,要求库提供可 变替代以使其更容易在大数据结构的中间改变一些元素也并非是一件稀奇的事情。例如, 类 StringBuilder 是不可变的 String 的可变替代。第十八章中我们会给出更多 Scala 里 设计可变对象的细节。 Drop files to upload. #272关键字 this 指向当前执行方法被调用的对象实例,或者如果使用在构造器里的话,就是 正被构建的对象实例。 Drop files to upload. #273Scala 里的每一个从构造器的第一个动作都是调用同一个类里面其他的构造器。换句话说 就是,每个 Scala 类里的每个从构造器都是以“this(...)”形式开头的。被调用的构造 器既可以是主构造器(好像 Rational 这个例子),也可以是从文本上来看早于调用构造器 的其它从构造器。这个规则的根本结果就是每一个 Scala 的构造器调用终将结束于对类的 主构造器的调用。因此主构造器是类的唯一入口点。 Drop files to upload. #274依照这个函数文本在运行时创建的函数值(对象)被称为闭包:closure。名称 源自于通过“捕获” 自由变量的绑定对函数文本执行的“关闭”行动。不带自由变量的函数文本,如(x: Int) => x + 1,被称为封闭术语:closed term,这里术语:term 指的是一小部分源代码。因此依照这个函数 文本在运行时创建的函数值严格意义上来讲就不是闭包,因为(x: Int) => x + 1在编写的时候 就已经封闭了。但任何带有自由变量的函数文本,如(x: Int) => x + more,都是开放术语:open term。因此,任何依照(x: Int) => x + more在运行期创建的函数值将必须捕获它的自由变量, more,的绑定。由于函数值是关闭这个开放术语(x: Int) => x + more 的行动的最终产物,得 到的函数值将包含一个指向捕获的 more 变量的参考,因此被称为闭包。 Drop files to upload. #275优先使用算子,优先使用函数 Drop files to upload. #276优先使用无副作用的东西 Drop files to upload. #277scala控制抽象 Drop files to upload. #278第 6 章介绍了 Scala 一些基本面向对象的方面。本章将拾起第 6 章省略的部分并更加深入到 Scala 的面向对象编程的细节中去。我们将比较类的两个基础关系:组合与继承。组合意味着一个类持 有另一个的参考,使用参考类帮助实现任务。继承是超类/子类的关系。除此之外,我们还将讨 论抽象类,无参数方法,扩展类,重载方法和字段,参数化字段,调用超类构造器,多态和动态 绑定,final 成员和类,还有工厂对象和方法。 Drop files to upload. #279'hello'.length // 没有副作用,所以无须() println() // 最好别省略() Drop files to upload. #280'hello'.length // 没有副作用,所以无须() println() // 最好别省略() Drop files to upload. #281为了在语法和概念层面更加简明扼要地使用这些回调,Scala还提供了flatMap、foreach和filter等算子,使得我们能够以非阻塞的方式对future进行组合。当然,future仍然支持阻塞操作——必要时,可以阻塞等待future(不过并不鼓励这样做) Drop files to upload. #295遇到对象无法访问的情况,检查包引用关系,看看包内的方法是否被标记private[X] protect[X] Drop files to upload. #297这个对象和上一个创建的类ChecksumAccumulator同名,这在Scala中把这个对象成为其同名的类的“伴侣”对象(Companion object)。 如果你需要定义的类的companion对象,Scala要求你把这两个定义放在同一个文件中。类和其companion对象可以互相访问对方的私有成员。 Drop files to upload. #299这样定义的函数变量addMore 成为一个“闭包”。因为它引用到函数外面定义的变量。定义这个函数的过程,是将这个自由变量捕获而构成一个封闭的函数。有意思的是,当这个自由变量发生变化时,Scala的闭包能够捕获到这个变化,因此Scala的闭包捕获的是变量本身而不是当时变量的值。 Drop files to upload. #300创建新的控制结构 不是很懂 Drop files to upload. #301继承和绑定 Drop files to upload. 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