[2013-01-15]The Little Schemer 学习笔记
《The Little Schemer》 FP编程、lisp入门必备
该书大部分内容,会在左边给你一段“代码”,右边给你详细的解释,然后从上到下,就是解释“代码”的运行过程。就跟单步调试一样的流程。过程有点像思维训练,刚开始觉得有趣,看到后来觉得枯燥,但是事实上最好多看几遍。
摘记一下五法十诫
Five Laws
The Law of Car:
The primitive car is defined only for non-empty lists
The Law of Cdr:
The primitive cdr is defined only for non-empty lists. The cdr of any non-empty list is always another list.
The Law of Cons:
The primitive cons takes two arguments. The second argument to cons must be a list. The result is a list.
The Law of Null?:
The primitive null? is defined only for lists.
The Law of Eq?:
The primitive eq? takes two arguments. Each must be a non-numeric atom.
Ten Commandments
The First Commandment
When recurring on a list of atoms, lat, ask two questions about it : (null? lat) and else.
When recurring on a number, n, ask two questions about it : (zero? n) and else.
When recurring on a list of S-exp, l, ask three question about it: (null? l), (atom? (car l)), and else.
The Second Commandment
Use cons to build lists.
The Third Commandment
When building a list, describe the first typical element, and then cons it onto the natural recursion.
The Fourth Commandment
Always change at least one argument while recurring.
When recurring on a list of atoms, lat, use (cdr lat).
When recurring on a number, n, use (sub1 n). And when recurring on a list of S-exp, l, use (car l) and (cdr l) if neither (null? l) noe (atom? (car l)) are true.
It must be changed to be closer to termination.
The changing argument must be tested in the termination condition:
when using cdr, test termination with null? and when using sub1, test termination with zero?
The Fifth Commandment
When building a value with o+, always use 0 for the value of the terminating line, for adding 0 does not change the value of an addition.
When building a value with *, always use 1 for the value of the terminating line, for multiplying by 1 does not change the value of a multiplication.
When building a value with cons, always consider () for the value of the terminating line.
The Sixth Commandment
Simplify only after the function is correct.
The Seventh Commandment
Recur on the subparts that are of the same nature:
* On the sublists of a list.
* On the subexpressions of an arithmetic expression.
The Eighth Commandment
Use help function to abstract from representations.
The Ninth Commandment
Abstract common patterns with a new function
[2013-01-15]The Little Schemer 学习笔记的更多相关文章
- 《C++ Primer Plus》15.5 类型转换运算符 学习笔记
C++相对C更严格地限制允许的类型转换,并添加4个类型转换运算符,是转换过程更规范:* dynamic_cast:* const_cast:* static_cast:* reinterpret_ca ...
- 01.第一章_C++ Primer学习笔记_开始
1.2 初始输入输出 iostream库里面包含两个基础类型istream和ostream,分别表示输入流和输出流,一个流就是一个字符序列,从IO设备读出或者写入IO设备. 标准的输入输出对象 标准库 ...
- 2018/2/15 ES Beats的学习笔记
Beats其实是几种服务的统称(你也可以把收集到的数据存储到别的数据源,不一定非要ES),这几种服务分别是: 1.PacketBeat 通过抓包的方式来监控一些服务.如:HTTP,DNS,Redis, ...
- 2015.05.15,外语,学习笔记-《Word Power Made Easy》 01 “如何讨论人格特点”
2015.03.17,外语,读书笔记-<Word Power Made Easy> 01 “如何讨论人格特点”学习笔记 SESSIONS 1 本来这些章节都是在一两年前学习的,现在趁给友人 ...
- 20145213《Java程序设计》第八周学习笔记
20145213<Java程序设计>第八周学习笔记 教材学习内容总结 "桃花春欲尽,谷雨夜来收"谷雨节气的到来意味着寒潮天气的基本结束,气温回升加快.刚出冬的我对于这种 ...
- 20145213《Java程序设计学习笔记》第六周学习总结
20145213<Java程序设计学习笔记>第六周学习总结 说在前面的话 上篇博客中娄老师指出我因为数据结构基础薄弱,才导致对第九章内容浅尝遏止地认知.在这里我还要自我批评一下,其实我事后 ...
- NuGet学习笔记(2) 使用图形化界面打包自己的类库[转]
http://www.cnblogs.com/lzrabbit/archive/2012/05/01/2477607.html 上文NuGet学习笔记(1) 初识NuGet及快速安装使用说到NuGet ...
- 【Cocos2d-x】学习笔记目录
从2019年7月开始学习游戏引擎Cocos2dx,版本3.17. 学习笔记尽量以白话的形式表达自己对源码的理解,而不是大篇幅复制粘贴源码. 本人水平有限,欢迎批评指正! Cocos2d-x 学习笔记 ...
- Puppet学习笔记(CentOS6.3+Puppet3.01)
Puppet学习笔记(CentOS6.3+Puppet3.01) 技术 Add comments Oct262012 下了决心,好好学习puppet,周末专门去参加一个puppet的培训,难得朋友那 ...
随机推荐
- 移动端https抓包那些事--初级篇
对于刚刚进入移动安全领域的安全研究人员或者安全爱好者,在对手机APP进行渗透测试的时候会发现一个很大的问题,就是无法抓取https的流量数据包,导致渗透测试无法继续进行下去. 这次给大家介绍一些手机端 ...
- 用letsencrypt搭建免费的https网站
环境:阿里云服务器centos7.3,nignx,letsencrypt做免费的https证书 Let’s Encrypt官网:https://letsencrypt.org/ 1.服务器开放端口:4 ...
- iOS-联系人应用(一)
环境:xcode6,iphone 4s simulator with iOS8.0 一.功能界面介绍 1.1 应用启动进入联系人列表页面,数据为模拟数据,来源与一个plist文件: 1.2 点击右上角 ...
- Linux服务器中安装Oracle
笔者手动安装成功 一,oracle安装前的准备与配置 1,修改stsctl.conf文件 Linux是为小文件设计的,Oracle数据库安装需要占用较多资源,要把各项参数调大. 使用vi编辑/etc/ ...
- R语言 write.xlsx() 写入同一excel,及同一sheet注意
write.xlsx(x, file, sheetName="Sheet1", col.names=TRUE, row.names=TRUE, append=FALSE, show ...
- No simulation input file assignm…
QuartusII中仿真时出现No simulation input file assignment specified on simulator page of the settings dialo ...
- git分支管理之Bug分支
软件开发中,bug就像家常便饭一样.有了bug就需要修复,在Git中,由于分支是如此的强大,所以,每个bug都可以通过一个新的临时分支来修复,修复后,合并分支,然后将临时分支删除. 当你接到一个修复一 ...
- Autofac in webapi2
安装包:Autofac.webapi2 注意: install-package autofac.webapi2 (注意:您的项目中如果使用的是webapi2,此处必须为webapi2而不是webapi ...
- Oracle 11.2.0.1 ADG环境MRP进程遭遇ORA-600异常终止
环境:Linux + Oracle 11.2.0.1 ADG 现象:发现备库没有应用日志 1. 数据库查询备库目前状态 发现备库目前没有应用日志,apply lag已经显示备库有3天21小时多没有应用 ...
- Oracle基础--体系
1. 连接到Oralce At the operating system prompt, enter the following command to start the SQLCommand Lin ...