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Different types of thread-safe Sets in Java
There seems to be a lot of different implementations and ways to generate thread-safe Sets in Java.
Some examples include
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Replacing column values in a pandas DataFrame
...mn of a dataframe. The column ('female') only contains the values 'female' and 'male'.
11 Answers
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What are the differences between .gitignore and .gitkeep?
What are the differences between .gitignore and .gitkeep ? Are they the same thing with a different name, or do they both serve a different function?
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Adding div element to body or document in JavaScript
... but it also removes the current contents in body. How to add div element and keep contents on body?
9 Answers
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MAC addresses in JavaScript
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Using Java (with a signed applet)
Using signed Javascript, which in FF (and Mozilla in general) gets higher privileges than normal JS (but it is fairly complicated to set up)
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Method overloading in Objective-C?
...ring *)aString;
(the names of the two methods are "writeToFile:fromInt:" and "writeToFile:fromString:").
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MySQL: how to get the difference between two timestamps in seconds
...ence between two timestamps in seconds, or would I need to do that in PHP? And if so, how would I go about doing that?
4 An...
Ruby: What is the easiest way to remove the first element from an array?
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Note this mutates the array and returns nil on an empty array. See drop for an alternative, as mentioned in the other answer.
– Jay
Oct 15 '15 at 21:37
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Difference between this and self in JavaScript
... // true
If you're using a function that is executed in the global scope and is not in strict mode, this defaults to window, and therefore
function foo() {
console.log(
window.self === window, // is self window?
window.self === this, // is self this?
this === window ...
lock(new object()) — Cargo cult or some crazy “language special case”?
I'm reviewing some code written by a consultant, and while dozens of red flags have already popped up, I can't wrap my head around the following snippet:
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