book of ruby

KVC (keyvaluecoding) "Key-value-code" is a mechanism for accessing class instance variables directly through the string's name (key).KVC can be used to access and set the value of an instance variable.Setting mode: [Self setvalue:aname forkey:@ "name"][Self setvalue:aname forkeypath:@ "Person.name"]Access mode: astring = [self valueforkey:@ "name"]astring = [Self valueforkeypath:@ "person.name"]1 Main function Contents2Person *xiaoli =[[Person alloc]init];3 //

This article mainly introduces some of the basic methods of manipulating strings in Ruby, including the processing of string compression and decompression, the need for friends can refer to the following A string object in Ruby holds and manipulates one or more bytes of any sequence, usually representing the character representation of the human language. Simple string literals are enclosed in single quot

Due to work relationships, I have never had time to learn Ruby. Recently, I finally had time to learn Ruby. I also opened a blog on csdn to record my learning experience, of course, it's not just Ruby. In recent years, dynamic languages have been very popular, and I personally like the simplicity of dynamic languages very much. Unfortunately, I have never spent a

). insert (I * 3 + 2, self. monthly_amount_by_province (m, province )) Sheet1.row (row). insert (I * 3 + 3, self. monthly_orders_count_by_province (m, province )) End End Path = "tmp/phone_recharge.xls" Book. write path Path End 17. inject ({}) The Code is as follows: Selected_conditions = base_conditions.inject ({}) do | hash, data | Hash [data. first] = data. last unless data. last. blank? Hash End 18. time_str.instance_of? The Code is as follows: R

Andorid: Book-turning effect; andorid: Book-turning EffectContent Project Structure Environment Demo References The book turning effect mainly uses the method of drawing the besell curve. This article has three demos: Simple book flip. After the next page is turned over, the current page will not disappe

Le Book is a multi-advantage function in one of the efficient Office tools, with writing books, writing manuals, making e-books, multi-person online cloud collaboration Office, conversion document format and other functions. Many operations can be done directly by the mouse drag and drop, the interface is simple and lightweight, easy to get started, and no need to download any software, directly on the web to achieve all operations. At the same time,

Use Python to implement the book expiration reminder, and use python to implement the book expiration reminder 1. Simulate login to the Library Management System Let's take a look at the login page (many schools have these management system pages that are very low ): Two methods are used to simulate the login to the Library: 1. Construct a logon form to simulate Logon This method of simulated login seems t

I have always believed that it is always best to learn about any new technology and the excellent books related to it. Of course, a good video tutorial can help you get to know the technology quickly, but to learn the technology in depth and in a systematic way, the best books are especially important. In combination with my own experience and lessons learned from Java, I make a list of some good books I've seen, which is my suggested reading order.1. The first

Original from: Miroslav |http://fangjie.sinaapp.com/?p=88 Reprint Please indicate the sourceGitHub: https://github.com/JayFang1993/BookScaningfirst of all, we can see the effect show:http://fangjie.sinaapp.com/?page_id=54Mainactivity.java is the activity of the main interface. Bookview.java is the interface of displaying basic information of books, Captureactivity.java is scanning lens interface, reviewactivity is the list interface of notes, Reviewcontent.java is the specific interface of not

Today to the bookstore to see a book called "C # Internet of Things Programming fundamentals " books, interested in the internet of things I grabbed to see, the book is the project is the host computer development projects, simpler, if the Internet of things development is just this, it seems that I do IoT development is more than enough. I looked at this book fo

In the previous section, we talked about the Library management system login, I believe that we have a jade template and angular JS also have a understanding, today we look at a book information input. Here we are going to use the NoSQL database, which is used by MongoDB in this blog post. Ok. Mongo DB Installation I don't have to say much, then the node. JS Platform uses mongodb what extension package we use, I think it is mongoose more appropriate,

]Install the gem package from native$ Gem install-l [Gemname].gemInstall the specified version of the gem package$ gem install [gemname]--version=[ver]Update all installed gem packs$ gem UpdateUpdate the specified GEM packageNote: Gem Update [gemname] does not upgrade an older version of the package, you can use the gem install [gemname]--version=[ver] instead$ gem Update [Gemname]Delete the specified gem package, note that this command will remove all installed versions$ gem Uninstall [Gemname]

It has been a long time since I got this book. It took me one month to finish reading it. After several days, I finally wrote a book review. This book is from Leo's friendship, but it is a pity that the pages in the book are slightly damaged, but it does not affect reading. Leo is able to publish this series

Using Builder to create XML Builder installation Method: Gem Install Builder Require ' builder ' x = builder::xmlmarkup.new (: Target => $stdout,: Indent => 1) # ": Target => $stdout" Parameters: Indicates that the output will be written to the standard output console # ": Indent =>1" parameter: The XML output form will be indented into a space character x.instruct!: XML, : Version => ' 1.1 ',: Encoding => ' gb2312 ' x.comment!