Ray's playground

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摘要： C++ is a general-purposeprogramming language with a bias towards systems programming that　　– is a better C,　　– supports data abstraction,　　– supports object-orientedprogramming, and　... 阅读全文

摘要： In JMS, there are two types of destination: queues and topics. Each of these isassociated with a specific messaging model, either point-to-point (for queues) orpublish-subscribe (for topics).　　Althoug... 阅读全文

摘要： Hibernate provides a dual-layer caching system with a first-level object cache(the Session) and a pluggable second-level data cache. The first-level cache isalways active—it’s used to reso... 阅读全文

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摘要： Putting code inside a module or class is a good way of separating it from other code.Ruby’s Math module is a good example—it defines constants such as Math::PI and Math::Eand methods such ... 阅读全文

摘要： 1. ==　　JavaScript has two sets of equality operators: === and !==, and their evil twins == and !=. The good ones work the way you would expect. If the two operands are of the same type and have the sa... 阅读全文

摘要： 1. Global Variables　　There are three ways to define global variables. The first is to place a var statement outside of any function:　　The second is to add a property directly to the global object. The... 阅读全文

摘要： I want to avoid idioms that look like mistakes.　　I never allow switch cases to fall through to the next case. I once found a bug in my code caused by an unintended fall through immediately after havin... 阅读全文

摘要： JavaScript includes a small set of standard methods that are available on thestandard types.　　array.concat(item...)[代码]2varb=['x','y','z'];3varc=a.concat(b,true);　　array.join(separator)[代码]2a.push('d'... 阅读全文