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How to check if a file is a valid image file?
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A lot of times the first couple chars will be a magic number for various file formats. You could check for this in addition to your exception checking above.
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RegEx for matching UK Postcodes
... this postcode versus any other postcode; probably never? This means every time the regex is used, it must exhaust this option first before proceeding to the next option. To see how performance is impacted check the number of steps the original regex took (35) against the same regex after having fli...
Can I have multiple :before pseudo-elements for the same element?
... an element can only have at most one of any kind of pseudo-element at any time. (This means an element can have both a :before and an :after pseudo-element — it just cannot have more than one of each kind.)
As a result, when you have multiple :before rules matching the same element, they will al...
Colorized Ruby output to the terminal [closed]
Using Ruby, how can I perform background and foreground text colorization for output in the terminal?
11 Answers
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NHibernate vs LINQ to SQL
...tructure. For simple applications, this is perfectly acceptable (and oftentimes even preferable), but for more complex applications devs will often suggest using a domain driven design pattern instead (which is what NHibernate facilitates).
The problem with the table-per-class pattern is that your...
Match multiline text using regular expression
I am trying to match a multi line text using java. When I use the Pattern class with the Pattern.MULTILINE modifier, I am able to match, but I am not able to do so with (?m).
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How do I make JavaScript beep?
...I paste this in as a snippet in Chrome developer tools, it works the first time I run it. But subsequent runs fail.
– P i
Jan 1 '16 at 10:58
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Type erasure techniques
...tion) §25.3, states:
Variants of the technique of using a single runt-time representation for values of a number of types and relying on the (static) type system to ensure that they are used only according to their declared type has been called type erasure.
In particular, no use of virtual f...
Can Selenium Webdriver open browser windows silently in background?
...a disappointment since the Chrome's headless mode achieves > 30% better time than the UI one. The other headless driver PhantomJS delivers 34.92% better than the Chrome's headless mode. Surprisingly for me, the Edge browser beats all of them.
var options = new FirefoxOptions();
options.AddArgum...
How do you create a dictionary in Java? [closed]
... way, you actually don't need to include <String, String> the second time. You can just do Map<String, String> map = new HashMap<>();
– Samuel Noyes
Apr 6 '16 at 15:12
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