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What is the use of ObservableCollection in .net?
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ObservableCollection is a collection that allows code outside the collection be aware of when changes to the collection (add, move, remove) occur. It is used heavily in WPF and Silverlight but its use is not limited to there. Code can add event handlers to see when...
How do I invoke a Java method when given the method name as a string?
... has no arguments, only give methodName).
Then you invoke that method by calling
try {
method.invoke(obj, arg1, arg2,...);
} catch (IllegalArgumentException e) { ... }
catch (IllegalAccessException e) { ... }
catch (InvocationTargetException e) { ... }
Again, leave out the arguments in .in...
Add UIPickerView & a Button in Action sheet - How?
...oblem and ultimately decided to take a different approach. I replaced the call to show the action sheet with a modal view controller containing a simple tableview.
There are many ways to accomplish this. Here's one way that I just implemented in a current project. It's nice because I can reuse it ...
Animated loading image in picasso
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32
@DBragion it works great but for large images, it scalled up. can we fix width and height of it to a number like 32x32 pixels?
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What does the term “porcelain” mean in Git?
The term "porcelain" appears occasionally in the Git documentation. What does it mean?
9 Answers
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JavaScript check if variable exists (is defined/initialized)
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You want the typeof operator. Specifically:
if (typeof variable !== 'undefined') {
// the variable is defined
}
share
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improve this answer
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What's the difference between Ruby's dup and clone methods?
..., name: "Favorites">
clone creates a new object with the same id, so all the changes made to that new object will overwrite the original record if hitting .save
category2 = category.clone
#=> #<Category id: 1, name: "Favorites">
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Difference between new and override
...se the last defined
implementation of a method. Even if
the method is called on a reference to
the base class it will use the
implementation overriding it.
public class Base
{
public virtual void DoIt()
{
}
}
public class Derived : Base
{
public override void DoIt()
{
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Javascript call() & apply() vs bind()?
I already know that apply and call are similar functions which set this (context of a function).
22 Answers
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Using Chrome's Element Inspector in Print Preview Mode?
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Changed in Chrome 32 35+
(In Chrome 35+ the "Emulation" tab is present by default. Also, the console is available from any primary tab.)
In DevTools, go to settings-> Overrides
enable "Show Emulation view in console drawer"
Close settin...