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How do you cast a List of supertypes to a List of subtypes?
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This lets me write: List<String> myList = (List<String>)(List<?>)(new ArrayList<Integer>()); This would crash at runtime. I prefer something like List<? extends Number> myList = new ArrayList<Integer>();
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Why are C# 3.0 object initializer constructor parentheses optional?
...; // double[]
var c = new[] { "hello", null, "world" }; // string[]
var d = new[] { 1, "one", 2, "two" }; // Error
Reference: http://msdn.microsoft.com/en-us/library/ms364047%28VS.80%29.aspx
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How to bind multiple values to a single WPF TextBlock?
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You can use a MultiBinding combined with the StringFormat property. Usage would resemble the following:
<TextBlock>
<TextBlock.Text>
<MultiBinding StringFormat="{}{0} + {1}">
<Binding Path="Name" />
<Bi...
Loaded nib but the 'view' outlet was not set
...s are right, but as I'm a newcomer it took me a little while to figure out all the steps to do that. Here's what worked for me:
Open the XIB file causing problems
Click on file's owner icon on the left bar (top one, looks like a yellow outlined box)
If you don't see the right-hand sidebar, click o...
What's the difference between [ and [[ in Bash? [duplicate]
...e. You no longer have to quote variables like mad because [[ handles empty strings and strings with whitespace more intuitively. For example, with [ you have to write
if [ -f "$file" ]
to correctly handle empty strings or file names with spaces in them. With [[ the quotes are unnecessary:
if [[ ...
jQuery SVG, why can't I addClass?
...ts className is a little different. For an SVG element, className is not a string, but an instance of SVGAnimatedString.
Consider the following code:
var test_div = document.getElementById('test-div');
var test_svg = document.getElementById('test-svg');
console.log(test_div.className);
console.l...
How to validate date with format “mm/dd/yyyy” in JavaScript?
...tion function is a little bit easier to read:
// Validates that the input string is a valid date formatted as "mm/dd/yyyy"
function isValidDate(dateString)
{
// First check for the pattern
if(!/^\d{1,2}\/\d{1,2}\/\d{4}$/.test(dateString))
return false;
// Parse the date parts t...
Explicitly set Id with Doctrine when using “AUTO” strategy
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New solution works fine only when ALL entities have id before insert. When one entity has ID and another one does not - new solution is failing.
I use this function for import all my data:
function createEntity(\Doctrine\ORM\EntityManager $em, $entity, $id ...
Mix Razor and Javascript code
...avascript blocks when executed but I hate how the syntax highlighting gets all sorts of confused. It highlights all the Razor code as invalid Syntax because it's stuck in Javascript mode I believe.
– Chev
Aug 10 '12 at 16:29
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How to output numbers with leading zeros in JavaScript [duplicate]
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NOTE: Potentially outdated. ECMAScript 2017 includes String.prototype.padStart
You're asking for zero padding? Not really rounding. You'll have to convert it to a string since numbers don't make sense with leading zeros. Something like this...
function pad(num, size) {
v...