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What is the difference between a weak reference and an unowned reference?
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Check out the examples on using strong, weak, and unowned in closures:
https://developer.apple.com/library/ios/documentation/swift/conceptual/swift_programming_language/AutomaticReferenceCounting.html
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Programming with white text on black background?
...xt on white background suits more people".
My answer refers to this one: https://graphicdesign.stackexchange.com/questions/15142/which-is-easier-on-the-eyes-dark-on-light-or-light-on-dark
As a person with astigmatism, I find white background with dark text is easier to read as the reference sugge...
Should I use PATCH or PUT in my REST API?
...only the activation field(partial modification)
according to the RFC5789 (https://tools.ietf.org/html/rfc5789)
The existing HTTP PUT method only allows a complete replacement of
a document. This proposal adds a new HTTP method, PATCH, to modify
an existing HTTP resource.
Also, in...
Using node.js as a simple web server
...t's already been done in one of the existing 800+ forks of this project:
https://github.com/nodeapps/http-server/network
Light Server: An Auto Refreshing Alternative
A nice alternative to http-server is light-server. It supports file watching and auto-refreshing and many other features.
$ npm...
What does O(log n) mean exactly?
...t, you'll want to have a general idea of Logarithm, which you can get from https://en.wikipedia.org/wiki/Logarithm . Natural science use e and the natural log. Engineering disciples will use log_10 (log base 10) and computer scientists will use log_2 (log base 2) a lot, since computers are binary ba...
What are sessions? How do they work?
...they could intercept the user's session key? Assuming the site doesn't use HTTPS, it seems like a third party could masquerade as the user with a session key even if the key is encrypted. The server would just decrypt it.
– user137717
Aug 1 '15 at 4:31
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How do you change Background for a Button MouseOver in WPF?
...answer that uses ControlTemplate and has an animation effect
(adapted from https://docs.microsoft.com/en-us/dotnet/framework/wpf/controls/customizing-the-appearance-of-an-existing-control)
In your resource dictionary define a control template for your button like this one:
<ControlTemplate Targ...
Declaring variables inside loops, good practice or bad practice?
...tely reflect what sir @justin was saying in 2nd comment....
try this here
https://practice.geeksforgeeks.org/problems/depth-first-traversal-for-a-graph/1. just give it a shot.... you will get it.Hope this help.
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Covariance and contravariance real world example
...parer<in T>,
// we can use a more generic type than required.
// See https://msdn.microsoft.com/en-us/library/8ehhxeaf.aspx for declaration syntax
var teacherSet = new SortedSet<Teachers>(teachers, new PersonNameComparer());
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Why does Twitter Bootstrap Use Pixels for Font Size?
...ill prefer Bootstrap with em and rem support you can take a look at this - https://github.com/ivayloc/twbs-rem-em there is no need to make any calculation to convert pixels in rem or em units, there is build in @mixins for this - @include rem(property, values) - also fallback to px and for em conver...