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What is an optional value in Swift?
...ny type:
var name: String? = "Bertie"
Optionals (along with Generics) are one of the most difficult Swift concepts to understand. Because of how they are written and used, it's easy to get a wrong idea of what they are. Compare the optional above to creating a normal String:
var name: String = "Ber...
What does %w(array) mean?
..., %i, %W, %I) as it is aligned with the standard array literals.
# bad
%w(one two three)
%i(one two three)
# good
%w[one two three]
%i[one two three]
For more read here.
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CSS margin terror; Margin adds space outside parent element [duplicate]
...d some good explaining. No solution is really 100% satisfying. But I guess one just have to live with it, margin must work this way or text formatting would be impossible. 99% of time it works as needed. But every now and then comes the issue when designing a layout. :P
– jamie...
How can I add an item to a IEnumerable collection?
...specified type), which, when enumerated, will provide all items of the old one, plus some of your own. You use Enumerable.Concat for that:
items = items.Concat(new[] { "foo" });
This will not change the array object (you cannot insert items into to arrays, anyway). But it will create a new objec...
How to count certain elements in array?
... use a function as the body of the loop anyway if you need to capture or clone your iteration index or value. For-loops are more efficient generally, but sometimes you need a closure.)
The most readable way:
[....].filter(x => x==2).length
(We could have written .filter(function(x){return x==...
Casting vs using the 'as' keyword in the CLR
...n. That throws an exception immediately, which means that no more work is done under incorrect assumptions, and the exception correctly shows the type of bug.
// This will throw an exception if randomObject is non-null and
// refers to an object of an incompatible type. The cast is
// the best code...
How to debug template binding errors for KnockoutJS?
...
One thing that I do quite often when there is an issue with what data is available at a certain scope is to replace the template/section with something like:
<div data-bind="text: ko.toJSON($data)"></div>
Or,...
How do I disable the “Press ENTER or type command to continue” prompt in Vim?
...
I'm not sure how to do it globally though for one command:
:silent !<command>
Be sure to include a space after silent
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What exactly is OAuth (Open Authorization)?
...In. Adding all of your many, many friends manually is tiresome and error-prone. You might get fed up half-way or insert typos in their e-mail address for invitation. So you might be tempted not to create an account after all.
Facing this situation, LinkedIn has the Good Idea(TM) to write a program ...
Sound effects in JavaScript / HTML5
...
This is a better answer than the accepted one, as it focuses on the correct solution to the problem (WebAudio API), and the reasons Audio elements aren't a good solution, rather than trying to hack together a bad solution with Audio elements
– A...