end if without block if error

The Block chain (blockchain) is now a big hit, with a lot of news media reporting that it will create the future. But there are very few introductory articles that are easy to understand. What is so special about the block chain is that there are

Learning goals in this chapter: 1. Understand what block is. 2. Understand how block is used. Block is an iOS new program syntax after 4.0, strictly speaking, the concept of block is not the scope of the basic program design, for

The Analysis of ios video project mainly focuses on block details. If you understand the definition of block, but are not very familiar with the application, refer to this article, iosblock Analysis of film and TV projects on github This project can

Transferred from: Http://bbs.ednchina.com/BLOG_ARTICLE_172025.HTM(3) Fault-tolerant operationLet's take a look at the rule definition for fault tolerance.* After the reset response, the first data block is sent from the terminal to the IC card, and

Block for iOS Source: codingZeroIntroduction IOS programmers who do not use block, not qualified programmersAfter learning block, you don't want to use tedious agents anymore.Block is not as difficult as you think, do not be afraid, do not be afraid,

The main content of this article Understand what a block is. Learn how block is used. Block is the new program syntax for iOS after version 4.0.After iOS SDK 4.0, block appears in almost all new versions of the API, in other words,

1. Block: A block in Ruby is a code block composed of multiple lines of code. It can be considered as an anonymous method and is often used to iterate an array or range (such as the each or times method ); the syntax format is as follows: { // Code }

Block is added after iOS 4.0 and is heavily used in the new iOS API. Block is an anonymous piece of code that can be used as a parameter to another object and get the return value. In essence, block is similar to other ordinary variables, except

IOS block starts from scratchAfter iOS4.0, Block was born, it itself encapsulated a piece of code and the code as a variable, through the block () way callback.Structure of blockLet's start with a simple code to see:void (^myBlock)(int a) = ^(int a){

Detailed description of the code block and parameter transfer in Ruby, detailed description of ruby code transfer 1. Block DeclarationAfter the function is called, the block declaration is enclosed by {...}, Or do. end encapsulation. {} Is generally