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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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Deprecated warning for Rails 4 has_many with order
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In Rails 4, :order has been deprecated and needs to be replaced with lambda scope block as shown in the warning you've posted in the question. Another point to note is that this scope block needs to be passed before any other association options such as dep...