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Converting RGB to grayscale/intensity
... from RGB to grayscale, it is said that specific weights to channels R, G, and B ought to be applied. These weights are: 0.2989, 0.5870, 0.1140.
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What is the difference between `raise “foo”` and `raise Exception.new(“foo”)`?
...echnically, the first raises a RuntimeError with the message set to "foo", and the second raises an Exception with the message set to "foo".
Practically, there is a significant difference between when you would want to use the former and when you want to use the latter.
Simply put, you probably w...
What is the difference between `new Object()` and object literal notation?
...done something unusual), other than that your second one creates an object and adds a property to it. But literal notation takes less space in the source code. It's clearly recognizable as to what is happening, so using new Object(), you are really just typing more and (in theory, if not optimized ...
Efficient way to determine number of digits in an integer
...1; if (x < 100) return 2; etc., so that the function will do less tests and exit faster.
– squelart
Sep 28 '09 at 23:44
29
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Bootstrap 3 breakpoints and media queries
... No media query since this is the default in Bootstrap
// Small devices (landscape phones, 576px and up)
@media (min-width: 576px) { ... }
// Medium devices (tablets, 768px and up)
@media (min-width: 768px) { ... }
// Large devices (desktops, 992px and up)
@media (min-width: 992px) { ... }
// Ex...
How to minify php page html output?
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CSS and Javascript
Consider the following link to minify Javascript/CSS files: https://github.com/mrclay/minify
HTML
Tell Apache to deliver HTML with GZip - this generally reduces the response size by about 70%. (If you use Apach...
How can you make a custom keyboard in Android?
I want to make a custom keyboard. I don't know how to do it using XML and Java. The following picture is a model of the keyboard I want to make. It only needs numbers.
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Getting a File's MD5 Checksum in Java
...arwnikk It works fine in Java 8. MethodNotFound is not an exception from standard Java; perhaps you are talking about a compiler error? In any case, if it doesn't work for you, it's a local configuration problem, or a problem with other code.
– erickson
Jun 23 ...
Efficient way to remove keys with empty strings from a dict
I have a dict and would like to remove all the keys for which there are empty value strings.
17 Answers
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Using CSS for a fade-in effect on page load
... text-align: center;
-webkit-animation: fadein 2s; /* Safari, Chrome and Opera > 12.1 */
-moz-animation: fadein 2s; /* Firefox < 16 */
-ms-animation: fadein 2s; /* Internet Explorer */
-o-animation: fadein 2s; /* Opera < 12.1 */
animation: fadein 2s...