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When to use IMG vs. CSS background-image?
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I'm surprised no one's mentioned this yet: CSS transitions.
You can natively transition a div's background image:
#some_div {
background-image:url(image_1.jpg);
-webkit-transition:background-image 0.5s;
/* Other vendor-prefixed ...
Android: Expand/collapse animation
... if(interpolatedTime == 1){
v.setVisibility(View.GONE);
}else{
v.getLayoutParams().height = initialHeight - (int)(initialHeight * interpolatedTime);
v.requestLayout();
}
}
@Override
public boole...
How to move/rename a file using an Ansible task on a remote system
...use removes: /path/to/foo and creates: /path/to/bar. @Fonant already mentioned this as comment on another answer, but as this is the accepted one, I want to point it out again.
– Michael Trojanek
Sep 11 '17 at 16:10
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PHP and MySQL - how to avoid password in source code? [duplicate]
...ore the file. On the other hand, you might want a skeleton of the file, or one with reasonable defaults (the latter does not apply to login data, of course), to be version controlled. A common way to deal with that is to have a checked-in template configuration file, and the installation procedure c...
Why must jUnit's fixtureSetup be static?
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JUnit always creates one instance of the test class for each @Test method. This is a fundamental design decision to make it easier to write tests without side-effects. Good tests do not have any order-of-run dependencies (see F.I.R.S.T) and creat...
The constant cannot be marked static
...oid the confusion which could occur if a reader were to see two constants, one declared static and one not – they could easily assume that the difference in specification implied a difference in semantics. Having said that, there is no prohibition on redundantly specifying an access modifier which...
Designing function f(f(n)) == -n
...sitive integer will overflow, so it will work for all integers except that one.
To make it work for real numbers you need to replace the n in (-1)n with { ceiling(n) if n>0; floor(n) if n<0 }.
In C# (works for any double, except in overflow situations):
static double F(double n)
{
if ...
SLF4J: Failed to load class “org.slf4j.impl.StaticLoggerBinder”. error
...ror. Numerous configurations of the slf4j-api and logback were tested but none seem to work.
10 Answers
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Searching if value exists in a list of objects using Linq
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zvolkov's answer is the perfect one to find out if there is such a customer. If you need to use the customer afterwards, you can do:
Customer customer = list.FirstOrDefault(cus => cus.FirstName == "John");
if (customer != null)
{
// Use customer
}
...
Passing an array to a query using a WHERE clause
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for newbies to PHP like myself, can someone explain, or point me to a resource to explain, why this is prone to injection and how this should be done correctly to prevent that? What if the list of IDs is generated from a query immediately before this next query is...