I always find things like this more easily understood with pictures: Again, taking joseph daigle’s code, public class Foo { public /*virtual*/ bool DoSomething() { return false; } } public class Bar : Foo { public /*override or new*/ bool DoSomething() { return true; } } If you then call the code like this: Foo … Read more
Update C# 7.0 now has binary literals, which is awesome. [Flags] enum Days { None = 0, Sunday = 0b0000001, Monday = 0b0000010, // 2 Tuesday = 0b0000100, // 4 Wednesday = 0b0001000, // 8 Thursday = 0b0010000, // 16 Friday = 0b0100000, // etc. Saturday = 0b1000000, Weekend = Saturday | Sunday, Weekdays = … Read more
You can create an array with a range using splat, >> a=*(1..10) => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] using Kernel Array method, Array (1..10) => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] or using to_a (1..10).to_a => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
~ is a bitwise operator that flips all bits in its operand. For example, if your number was 1, its binary representation of the IEEE 754 float (how JavaScript treats numbers) would be… 0011 1111 1111 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 So ~ converts its operand to … Read more
It’s a shorthand for <?php echo $a; ?>. It’s enabled by default since 5.4.0 regardless of php.ini settings.
Question 1: Why does the following code compile without having a return statement? public int a() { while(true); } This is covered by JLS§8.4.7: If a method is declared to have a return type (§8.4.5), then a compile-time error occurs if the body of the method can complete normally (§14.1). In other words, a method … Read more
In Ruby Programming Language (“Methods, Procs, Lambdas, and Closures”), a lambda defined using -> is called lambda literal. succ = ->(x){ x+1 } succ.call(2) The code is equivalent to the following one. succ = lambda { |x| x + 1 } succ.call(2) Informally, I have heard it being called stabby lambda or stabby literal.
The major one is the ability to nest them, commands within commands, without losing your sanity trying to figure out if some form of escaping will work on the backticks. An example, though somewhat contrived: deps=$(find /dir -name $(ls -1tr 201112[0-9][0-9]*.txt | tail -1l) -print) which will give you a list of all files in … Read more
Edit: This is a more complete version that shows more differences between [ (aka test) and [[. The following table shows that whether a variable is quoted or not, whether you use single or double brackets and whether the variable contains only a space are the things that affect whether using a test with or … Read more
Add a second });. When properly indented, your code reads $(function() { $(“#mewlyDiagnosed”).hover(function() { $(“#mewlyDiagnosed”).animate({‘height’: ‘237px’, ‘top’: “-75px”}); }, function() { $(“#mewlyDiagnosed”).animate({‘height’: ‘162px’, ‘top’: “0px”}); }); MISSING! You never closed the outer $(function() {.