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Applicatives compose, monads don't
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115
If we compare the types
(<*>) :: Applicative a => a (s -> t) -> a s -> a t
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Concatenate multiple files but include filename as section headers
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Was looking for the same thing, and found this to suggest:
tail -n +1 file1.txt file2.txt file3.txt
Output:
==> file1.txt <==
<contents of file1.txt>
==> file2.txt <==
<contents of file2.txt>
==> file3.txt <==
<contents of file3.txt>
If there is only...
How do I start my app on startup?
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318
First, you need the permission in your AndroidManifest.xml:
<uses-permission android:name="...
Converting ISO 8601-compliant String to java.util.Date
I am trying to convert an ISO 8601 formatted String to a java.util.Date .
29 Answers
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How to process POST data in Node.js?
...mail: "john@example.com"
}
})
});
Node.js: (since Express v4.16.0)
// Parse URL-encoded bodies (as sent by HTML forms)
app.use(express.urlencoded());
// Parse JSON bodies (as sent by API clients)
app.use(express.json());
// Access the parse results as request.body
app.post('/', func...
How can I count occurrences with groupBy?
...;
System.out.println(counted);
}
}
Result:
{Hello=2, World=1}
(There's also the possibility of using groupingByConcurrent for more efficiency. Something to bear in mind for your real code, if it would be safe in your context.)
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How to wait for several Futures?
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You could use a for-comprehension as follows instead:
val fut1 = Future{...}
val fut2 = Future{...}
val fut3 = Future{...}
val aggFut = for{
f1Result <- fut1
f2Result <- fut2
f3Result <- fut3
} yield (f1Result, f2Result, f3Result)
In this example, futures 1, 2 and 3 a...
Display an array in a readable/hierarchical format
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18 Answers
18
Active
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Python syntax for “if a or b or c but not all of them”
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15 Answers
15
Active
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mongorestore error: Don't know what to do with the dump file [closed]
...un the following command mongorestore dump from the following path c:\hw1-1\dump (This contains the BSON files) I'm getting this error:
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