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Difference between events and delegates and its respective applications [closed]
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From the technical standpoint, other answers have addressed the differences.
From a semantics perspective, events are actions raised by an object when certain conditions are met. For example, my Stock class has a property c...
How to convert a DOM node list to an array in Javascript?
... you can now can use in modern environments the spread syntax or the Array.from method:
const array = [ ...nodeList ] // or Array.from(nodeList)
But thinking about it, I guess the most common use case to convert a NodeList to an Array is to iterate over it, and now the NodeList.prototype object h...
How do I create a datetime in Python from milliseconds?
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Just convert it to timestamp
datetime.datetime.fromtimestamp(ms/1000.0)
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Fastest way to get the first object from a queryset in django?
Often I find myself wanting to get the first object from a queryset in Django, or return None if there aren't any. There are lots of ways to do this which all work. But I'm wondering which is the most performant.
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Android and setting width and height programmatically in dp units
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You'll have to convert it from dps to pixels using the display scale factor.
final float scale = getContext().getResources().getDisplayMetrics().density;
int pixels = (int) (dps * scale + 0.5f);
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How to capitalize the first letter of a String in Java?
I am using Java to get a String input from the user. I am trying to make the first letter of this input capitalized.
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How do I specify the exit code of a console application in .NET?
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3 options:
You can return it from Main if you declare your Main method to return int.
You can call Environment.Exit(code).
You can set the exit code using properties: Environment.ExitCode = -1;. This will be used if nothing else sets the return code or ...
Rails ActionMailer - format sender and recipient name/email address
...ully validate or escape the name and email, you can end up with an invalid From header by simply concatenating strings. Here is a safe way:
require 'mail'
address = Mail::Address.new email # ex: "john@example.com"
address.display_name = name.dup # ex: "John Doe"
# Set the From or Reply-To header ...
Function return value in PowerShell
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PowerShell has really wacky return semantics - at least when viewed from a more traditional programming perspective. There are two main ideas to wrap your head around:
All output is captured, and returned
The return keyword really just indicates a logical exit point
Thus, the following tw...
Creating .pem file for APNS?
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Here is what I did, From:blog.boxedice.com and "iPhone Advanced Projects" chapter 10 byJoe Pezzillo.
With the aps_developer_identity.cer in the keychain:
Launch Keychain Access from your local Mac and from the login keychain, filter by the Ce...