This works the same as a normal variable declaration would work: $foo = ‘bar’; // Created a new variable class Foo { function __construct() { $this->foo = ‘bar’; // Created a new variable } } PHP classes are not quite the same as in other languages, where member variables need to be specified as part … Read more
This is really a C question, because this behaviour was inherited directly from C (although it gets much more press in C++ because of the most vexing parse). I suspect the answer (in the context of C, at least) is that this allows you to scope the existence of your function declarations to precisely where … Read more
Nobody seems to be explaining the difference between an array and an object. [] is declaring an array. {} is declaring an object. An array has all the features of an object with additional features (you can think of an array like a sub-class of an object) where additional methods and capabilities are added in … Read more
When you read List<String> list = new ArrayList<String>(); you get the idea that all you care about is being a List<String> and you put less emphasis on the actual implementation. Also, you restrict yourself to members declared by List<String> and not the particular implementation. You don’t care if your data is stored in a linear … Read more
It’s nothing more than a reminder that if you do this: var x=5; var x; alert(x); Result will be 5. If you re-declare variable in some other languages for example – result will be undefined, or NaN, but not in javascript.
I refer to the C++11 standard in this post Declarations Declarations of the type we’re concerned with are known as simple-declarations in the grammar of C++, which are of one of the following two forms (§7/1): decl-specifier-seqopt init-declarator-listopt ; attribute-specifier-seq decl-specifier-seqopt init-declarator-list ; The attribute-specifier-seq is a sequence of attributes ([[something]]) and/or alignment specifiers (alignas(something)). … Read more
Not with object literals (this has the same value during constructing of the literal that it did before-hand). But you can do var carousel = new (function() { this.$slider = $(‘#carousel1 .slider’); this.panes = this.$slider.children().length; })(); This uses an object created from an anonymous function constructor. Note that $slider and panes are public, so can … Read more
I believe this was implemented in Java 1.5. The syntax allows you to call a method with a comma separated list of arguments instead of an array. public static void main(String… args); main(“this”, “is”, “multiple”, “strings”); is the same as: public static void main(String[] args); main(new String[] {“this”, “is”, “multiple”, “strings”}); http://today.java.net/article/2004/04/13/java-tech-using-variable-arguments http://download.oracle.com/javase/1.5.0/docs/guide/language/varargs.html
my restricts the scope of a variable. The scope of a variable is where it can be seen. Reducing a variable’s scope to where the variable is needed is a fundamental aspect of good programming. It makes the code more readable and less error-prone, and results in a slew of derived benefits. If you don’t … Read more
As of the LLVM Compiler version shipped with Xcode 4.3, if you try to call a method that the compiler has not previously seen, it will look in the rest of the current @implementation block to see if that method has been declared later. If so, then it uses that, and you don’t get a … Read more