language-features

问题 In PHP 5.4, I believe something like this is valid: echo ( new DateTime( '2014-04-05 10:36am' ))->format( 'Y-m-d g:ia' ); On PHP 5.3, I currently do something like this: $date = new DateTime( '2014-04-05 10:36am' ); echo $date->format( 'Y-m-d g:ia' ); Any way to combine those two lines into a single line in PHP 5.3 (and I don't mean by concatenating the lines)? Or will I have to upgrade to >=5.4 to have that option? 回答1: Will I have to upgrade to >=5.4 to have that option? Yes. You need to

问题 Can someone tell me what the code equivelant in VB.Net to this C# code is? new {name="value"} 回答1: This is called Anonymous Types and the VB equivalent is : New With {.Name = "value"} 回答2: That feature is called an anonymous type. 来源： https://stackoverflow.com/questions/407586/what-is-the-vb-net-code-equivelant-for-c-sharp-anonymous-type-code

问题 I don't know well Smalltalk, but I know some Objective-C. And I'm interested a lot in Smalltalk. Their syntax are a lot different, but essential runtime structures (that means features) are very similar. And runtime features are supported by runtime. I thought two languages are very similar in that meaning, but there are many features on Smalltalk that absent on Objective-C runtime. For an example, thisContext that manipulates call-stack. Or non-local return that unwinds block execution. The

问题 after creating a site you can go to: Site Actions / Site Settings / Site Administration / Language Settings and select some alternate language(s) if you've got some language pack(s) installed, but the default one is fix and you can't cange it anymore. Is there a way or some settings.file where you can change the default language? 回答1: OK, It's me again answering my own question(s)... http://sharepointchick.com/archive/2008/04/29/changing-the-language-of-an-existing-sharepoint-site.aspx It

问题 I've done some Python but have just now starting to use Ruby I could use a good explanation of the difference between "self" in these two languages. Obvious on first glance: Self is not a keyword in Python, but there is a "self-like" value no matter what you call it. Python methods receive self as an explicit argument, whereas Ruby does not. Ruby sometimes has methods explicitly defined as part of self using dot notation. Initial Googling reveals http://rubylearning.com/satishtalim/ruby_self

问题 This question already has answers here : Why can I add named properties to an array as if it were an object? (7 answers) Closed 5 years ago . I just found out that Arrays inherit directly from Object in javascript. I'm finding the difference between an array and an object is fairly minuscule. How do i know when to use one over the other? 回答1: When you need to depend on the order of the elements in the collection, use Arrays, when order is not important, use objects. Order is not guaranteed in

问题 Which other restrictions are there on names (beside the obvious uniqueness within a scope)? Where are those defined? 回答1: From the PDF of ECMA-335, Partition II, section 22, "Metadata preserves name strings, as created by a compiler or code generator, unchanged. Essentially, it treats each string as an opaque blob. In particular, it preserves case. The CLI imposes no limit on the length of names stored in metadata and subsequently processed by the CLI". If I've read this correctly and the

问题 I recently learned that Unicode is permitted within Java source code not only as Unicode characters (eg. double π = Math.PI; ) but also as escaped sequences (eg. double \u03C0 = Math.PI; ). The first variant makes sense to me - it allows programmers to name variables and methods in an international language of their choice. However, I don't see any practical application of the second approach. Here are a few pieces of code to illustrate usage, tested with Java SE 6 and NetBeans 6.9.1: This

问题 In some programming languages one can specify the function implementation for particular values of arguments: factorial[x] = x * factorial[x-1] factorial[0] = 1 Calling the function with 0 will use the second definition while calling it with 3 will use the first definition. I am aware that this is a kind of function overloading, but if I would search for languages with function overloading, I will find a lot that don't have this feature but only overload depending on arity or types. Is there

问题 I am very new to using cucumber (started today). It seems simple enough but I am having issues running a basic feature. Feature: Proof of concept that my framework works Scenario: My first test Given this is my first step When this is my second step Then this is my final step I know there is no code for it to test, but I wanted it to return the fact that the scenarios are undefined. I did some research and realised I had a .jar file which was unnecessary, I have since removed that. I still