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What's the advantage of a Java enum versus a class with public static final fields?
...nswered Dec 27 '12 at 0:10
Dave NewtonDave Newton
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Can I set variables to undefined or pass undefined as an argument?
... returns undefined, but if the function is a constructor (invoked with the new operator) it will return the new object (the value of this inside the constructor) despite not having a return statement. console.log((function (){}())); returns undefined. console.log((new function (){}())); returns an ...
JavaScript code to stop form submission
... This prevents the use of the enter key to submit the form. Also, new HTML5 attributes such as required won't work.
– Sam
Jul 7 '13 at 1:40
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CSS Progress Circle [closed]
...first solutions progress? could it be done with a data element? I'm rather new to animation
– anthonytherockjohnson
Mar 30 '17 at 8:37
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Is pass-by-value a reasonable default in C++11?
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@AaronMcDaid This is old news, in the sense that's something you always had to be aware of even before C++11. And nothing much has changed with respect to that.
– Luc Danton
Oct 22 '13 at 15:51
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How to make a background 20% transparent on Android
...e other way, instead of CC use 33 which is the hexadecimal for 255 * 0.2 = 51.
In order to calculate the proper value for an alpha transparency value you can follow this procedure:
Given a transparency percentage, for example 20%, you know the opaque percentage value is 80% (this is 100-20=80)
Th...
Mean per group in a data.frame [duplicate]
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summarise _each is deprecated in new version. What should I use intead? I tried summarise_at or _if or_all. but didn't work .
– ferrelwill
Dec 4 '17 at 22:22
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How do I catch a numpy warning like it's an exception (not just for testing)?
... barycentric style one to avoid using an explicit for-loop as opposed to a Newton's divided difference style one. The problem I have is that I need to catch a division by zero, but Python (or maybe numpy) just makes it a warning instead of a normal exception.
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Case insensitive comparison of strings in shell script
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Is this new in Bash 4? At least in Bash 3.2.51 (used in OS X 10.9) it does not work - the first echo statement results in: -bash: ${var1,,}: bad substitution
– Felix Rabe
Jun 11 '14 at 13:33
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Stopping scripters from slamming your website
...r people to make scripts.
Change your obfuscation technique right before a new item goes on sale. So even if the scripters can escalate the arms race, they are always a day behind.
EDIT: To be totally clear, Ned's article above describe methods to prevent the automated PURCHASE of items by prev...