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What is the difference between sites-enabled and sites-available directory?
What is use of these two directories in apache2 and how can we do it?
3 Answers
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Why does parseInt yield NaN with Array#map?
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The callback function in Array.map has three parameters:
From the same Mozilla page that you linked to:
callback is invoked with three arguments: the value of the element, the index of the element, and the Array object being...
Does Ruby have a string.startswith(“abc”) built in method?
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It's called String#start_with?, not String#startswith: In Ruby, the names of boolean-ish methods end with ? and the words in method names are separated with an _. Not sure where the s went, personally, I'd prefer String#starts_wit...
Comparing arrays in JUnit assertions, concise built-in way?
...ul. We asserted the arrays were equal, they're not, and we're given an indication why. From there, we can set a breakpoint, and examine the arrays in detail.
– Andy Thomas
Dec 1 '18 at 0:03
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Undo svn add without reverting local edits
... added a bunch of files that shouldn't be in the repository. I also have local edits in some files that I want to keep. Is there a simple way to just undo the svn add without reverting the local edits? The main suggestion I see on Google is svn revert , which supposedly undoes the local edits.
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Programmatically set height on LayoutParams as density-independent pixels
...dependent pixels (dp)? It looks like the height/width, when set programmatically, are in pixels and not dp.
5 Answers
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“Insert if not exists” statement in SQLite
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If you have a table called memos that has two columns id and text you should be able to do like this:
INSERT INTO memos(id,text)
SELECT 5, 'text to insert'
WHERE NOT EXISTS(SELECT 1 FROM memos WHERE id = 5 AND text = 'text to insert');
If a...
dplyr: “Error in n(): function should not be called directly”
...y the previous answer, you may have a conflict between plyr and dplyr. You can to run this command to unload the plyr package.
detach("package:plyr", unload=TRUE)
Then you can continue as expected.
library(dplyr)
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summarise(n = n())
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Simulate airplane mode in iPhone Simulator
...ly for NSURLConnection and its kin, but it could be more confusing if some calls work and some don't.
– Rob Napier
Dec 2 '09 at 14:09
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Overwrite or override
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The common used word is Override and it's not language-specific as you can also read from wikipedia: http://en.wikipedia.org/wiki/Method_overriding
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