shorthand

问题 I've been programming in PHP for years now, but I've never learned how to use any shorthand. I come across it from time to time in code and have a hard time reading it, so I'd like to learn the different shorthand that exists for the language so that I can read it and start saving time/lines by using it, but I can't seem to find a comprehensive overview of all of the shorthand. A Google search pretty much exclusively shows the shorthand for if/else statements, but I know there must be more

问题 I need to know what += does in python. It's that simple. I also would appreciate links to definitions of other short hand tools in python. 回答1: In Python, += is sugar coating for the __iadd__ special method, or __add__ or __radd__ if __iadd__ isn't present. The __iadd__ method of a class can do anything it wants. The list object implements it and uses it to iterate over an iterable object appending each element to itself in the same way that the list's extend method does. Here's a simple

问题 This question already has answers here : Closed 8 years ago . Possible Duplicate: Are PHP short tags acceptable to use? I'm just learning php and (been learning for about 6 months) and in a tutorial that I'm going through, it's using php shorthands, so when I looked it up on google, I came to this stack overflow question StackOverflow question where one of the popular answers says that shorthands are bad. I know one of the following comments then suggest that it's not bad but I also remotely

问题 I was killing time reading the underscore.string functions, when I found this weird shorthand: function count (str, substr) { var count = 0, index; for (var i = 0; i < str.length;) { index = str.indexOf(substr, i); index >= 0 && count++; //what is this line doing? i = i + (index >= 0 ? index : 0) + substr.length; } return count; } Legal: Think twice before using the function above without giving credit to underscore.string I put the line alone here, so you don't waste time finding it: index >

问题 How can I resolve logical entity names to full class names in Symfony2? Like MyAcmeBundle:User to My\AcmeBundle\Entity\User . 回答1: You can get the ClassMetadata from the EntityManager which will resolve the namespace into a fully qualified class name. <?php echo $manager->getClassMetadata('MyAcmeBundle:User')->getName(); 来源： https://stackoverflow.com/questions/11406697/how-can-i-resolve-myacmebundleuser-to-my-acmebundle-entity-user-in-symfony2

问题 here's the structure of the code: http://jsfiddle.net/ss1ef7sq/ although it's not really working at js fiddle but the code itself is working as i've tested it locally through firefox. this is where i've based this on: http://html.net/tutorials/javascript/lesson21.php jquery/ajax: $('#ep-101').click(function(){$('.main-container').load('link.html #ep101').hide().fadeIn(800);}); $('#ep-102').click(function(){$('.main-container').load('link.html #ep102').hide().fadeIn(800);}); $('#ep-103').click

问题 There is a very common and easy task of looped iteration through some range in both directions: var currentIndex = 0; var range = ['a', 'b', 'c', 'd', 'e', 'f']; function getNextItem(direction) { currentIndex += direction; if (currentIndex >= range.length) { currentIndex = 0; } if (currentIndex < 0) { currentIndex = range.length-1; } return range[currentIndex]; } // get next "right" item console.log(getNextItem(1)); // get next "left" item console.log(getNextItem(-1)); The code above works

问题 This question already has answers here : Difference between a += 10 and a = a + 10 in java? [duplicate] (5 answers) Is there any performance difference between using int a=a+1 and a++ in java? If so which is better and why? (6 answers) Closed 6 years ago . An example of thee shorthand Java Arithmetic operator is a += 4; for a=a+4; In The Complete Reference, Java 2, Herbert Schildt mentions "they are implemented more efficiently by the Java run-time system than are their equivalent" What makes

问题 This question already has answers here : Closed 8 years ago . Possible Duplicate: Are PHP short tags acceptable to use? Which is better to use, or considered better practice: <?php or <? . I've always wanted to know. Or is it more of a preference for the programmer. 回答1: <?php is the official standard. I've never encountered a problem where a browser was confused, but just using <? can also declare XML and might not be the best habit to form. I'll tell you this though - other programmers will

问题 I've written a library that extends several base Ruby classes with observing wrappers mostly through method aliasing. However, I've hit a roadblock with the Array instantiation shorthand (e.g. @a = [1, 2, 3] ) I can't seem to find any method that's actually called in the creation of an Array object by the shorthand means. It's not an inherited #[] method in the current scope or inherited from any class or module in the ancestors chain. I've also overloaded or watched every method from the