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NSDefaultRunLoopMode vs NSRunLoopCommonModes
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205
+50
A run l...
Hibernate: Automatically creating/updating the db tables based on entity classes
...ront makes a difference.
The reference suggests it should be hibernate.hbm2ddl.auto
A value of create will create your tables at sessionFactory creation, and leave them intact.
A value of create-drop will create your tables, and then drop them when you close the sessionFactory.
Perhaps you shoul...
What is the AppDelegate for and how do I know when to use it?
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256
I normally avoid the design approach implied by Andrew's use of the term "heart of your applic...
What does “Receiver type 'CALayer' for instance message is a forward declaration” mean here?
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edited Jul 17 '12 at 16:10
Kyle Clegg
35.5k2525 gold badges126126 silver badges137137 bronze badges
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Are nullable types reference types?
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edited Nov 5 '18 at 22:58
Structed
18666 silver badges1818 bronze badges
answered Jun 30 '10 at 12...
difference between iframe, embed and object elements
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124
<iframe>
The iframe element represents a nested browsing context. HTML 5 standard - "The...
How to specify font attributes for all elements on an html web page?
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251
* {
font-size: 100%;
font-family: Arial;
}
The asterisk implies all elements.
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Canvas width and height in HTML5
...lurry pixelated zoom-in
// with each canvas pixel drawn showing as roughly 2x2 on screen
canvas.width = 400;
canvas.height = 300;
canvas.style.width = '800px';
canvas.style.height = '600px';
See this live example of a canvas that is zoomed in by 4x.
var c = document.getElementsByTagName('c...
Can CSS detect the number of children an element has?
...ild { */
width: 100%;
}
/* two items */
li:first-child:nth-last-child(2),
li:first-child:nth-last-child(2) ~ li {
width: 50%;
}
/* three items */
li:first-child:nth-last-child(3),
li:first-child:nth-last-child(3) ~ li {
width: 33.3333%;
}
/* four items */
li:first-child:nth-last-child...
Relative frequencies / proportions with dplyr
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295
Try this:
mtcars %>%
group_by(am, gear) %>%
summarise(n = n()) %>%
mutate(freq...