a++ is post-increment: it increments after the statement is evaluated. By contrast, ++a increments before. Thus: $ a=0 ; ((a++)) ; echo $a $? 1 1 $ a=0 ; ((++a)) ; echo $a $? 1 0 In the first case, ((a++)), the arithmetic expression is evaluated first, while a is still zero, yielding a value … Read more
Update for PHP 7 (thanks shock_gone_wild) PHP 7 introduces the null coalescing operator which simplifies the below statements to: $var = $var ?? “default”; Before PHP 7 No, there is no special operator or special syntax for this. However, you could use the ternary operator: $var = isset($var) ? $var : “default”; Or like this: … Read more
There’s only one type of “if” statement there. The other is a conditional expression. As to which will perform better: they could compile to the same bytecode, and I would expect them to behave identically – or so close that you definitely wouldn’t want to choose one over the other in terms of performance. Sometimes … Read more
in_array() is what I use if (in_array($variable, array(‘one’,’two’,’three’))) {
you can use && operator – second operand expression is executed only if first is true direction == “right” && slideOffset += $(“.range-slide”).width() in my opinion if(conditon) expression is more readable than condition && expression
Starting a URL with // means “Use a different server but keep the same scheme” So if you load //example.net/script from https://example.com/ it will get https://example.net/script, while if you load it from http://example.com/ it will get http://example.net/script. If, on the other hand, you load it from file://c:/Users/You/Documents/test.html then it will probably not resolve to anything … Read more
Syntax: transition: <property> || <duration> || <timing-function> || <delay> [, …]; Note that the duration must come before the delay, if the latter is specified. Individual transitions combined in shorthand declarations: -webkit-transition: height 0.3s ease-out, opacity 0.3s ease 0.5s; -moz-transition: height 0.3s ease-out, opacity 0.3s ease 0.5s; -o-transition: height 0.3s ease-out, opacity 0.3s ease 0.5s; … Read more
What you have is a fairly unusual use of the ternary operator. Usually it is used as an expression, not a statement, inside of some other operation, e.g.: var y = (x == 2 ? “yes” : “no”); So, for readability (because what you are doing is unusual), and because it avoids the “else” that … Read more
The shorthand is: $(function() { // Code here });
How is it possible that this runs at all in any browser? Is is some sort of new ES6 functionality? Yes. … Method definitions A property of an object can also refer to a function or a getter or setter method. var o = { property: function ([parameters]) {}, get property() {}, set property(value) {}, … Read more