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Understanding promises in Node.js
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Promises in node.js promised to do some work and then had separate callbacks that would be executed for success and failure as well as handling timeouts. Another way to think of promises in node.js was that they were emitters that could emit only two events: success a...
PostgreSQL: How to pass parameters from command line?
...avoid going in and replacing all the ? with actual values, instead I'd like to pass the arguments after the query.
7 Answ...
When should the volatile keyword be used in C#?
Can anyone provide a good explanation of the volatile keyword in C#? Which problems does it solve and which it doesn't? In which cases will it save me the use of locking?
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Why doesn't Java allow generic subclasses of Throwable?
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As mark said, the types are not reifiable, which is a problem in the following case:
try {
doSomeStuff();
} catch (SomeException<Integer> e) {
// ignore that
} catch (SomeException<String> e) {
crashAndBurn()
...
What is the best way to convert an array to a hash in Ruby
...nswer follows.
Warning! Solutions using flatten will not preserve Array keys or values!
Building on @John Topley's popular answer, let's try:
a3 = [ ['apple', 1], ['banana', 2], [['orange','seedless'], 3] ]
h3 = Hash[*a3.flatten]
This throws an error:
ArgumentError: odd number of arguments f...
Undoing a 'git push'
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You need to make sure that no other users of this repository are fetching the incorrect changes or trying to build on top of the commits that you want removed because you are about to rewind history.
Then you need to 'force' push the old ...
Is there a null-coalescing (Elvis) operator or safe navigation operator in javascript?
...vascript currently doesn't have the other functionality. I'd recommend looking at CoffeeScript if you want an alternative syntax. It has some shorthand that is similar to what you are looking for.
For example The Existential Operator
zip = lottery.drawWinner?().address?.zipcode
Function shortc...
What does it mean to “program to an interface”?
...n of control and so on. There are some fairly heady discussions, so I'd like to take the opportunity to break things down a bit for understanding why an interface is useful.
When I first started getting exposed to interfaces, I too was confused about their relevance. I didn't understand why you n...
What exactly is an Assembly in C# or .NET?
...and reused on subsequent calls.
The assembly can also contain resources like icons, bitmaps, string tables and so on. Furthermore, the assembly also contains metadata in the assembly manifest - information like version number, strong name, culture, referenced assemblies and so forth.
In 99% of yo...
Regex to validate password strength
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You can do these checks using positive look ahead assertions:
^(?=.*[A-Z].*[A-Z])(?=.*[!@#$&*])(?=.*[0-9].*[0-9])(?=.*[a-z].*[a-z].*[a-z]).{8}$
Rubular link
Explanation:
^ Start anchor
(?=.*[A-Z].*[A-Z]) ...