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What is the difference between map and flatMap and a good use case for each?
...ct
res0: Array[String] = Array("Roses are red", "Violets are blue")
Now, map transforms an RDD of length N into another RDD of length N.
For example, it maps from two lines into two line-lengths:
rdd.map(_.length).collect
res1: Array[Int] = Array(13, 16)
But flatMap (loosely speaking...
What is an idiomatic way of representing enums in Go?
...return a.C
}
Inside the main package a.Baser is effectively like an enum now.
Only inside the a package you may define new instances.
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In which situations do we need to write the __autoreleasing ownership qualifier under ARC?
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Why is the __autoreleasing qualifier placed inbetween the stars, and not just in front of NSError**? This looks weird to me as the type is NSError**. Or is it because this is trying to indicate that the pointed-to NSError* pointer has to be qualified as po...
Animate text change in UILabel
...t the license stuff. What prevents people from using it in commercial apps now?
– Esqarrouth
Jun 5 '15 at 5:44
2
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How to get method parameter names?
... no metadata about their arguments. As a result, you will get a ValueError if you use inspect.getfullargspec() on a built-in function.
Since Python 3.3, you can use inspect.signature() to see the call signature of a callable object:
>>> inspect.signature(foo)
<Signature (a, b, c=4, *ar...
What is the $$hashKey added to my JSON.stringify result
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Angular adds this to keep track of your changes, so it knows when it needs to update the DOM.
If you use angular.toJson(obj) instead of JSON.stringify(obj) then Angular will strip out these internal-use values for you.
Also, if you change your repeat expression to use the track ...
What is the argument for printf that formats a long?
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Yep Dr Beco; further, just %l triggers warning: unknown conversion type character 0x20 in format [-Wformat]
– Patrizio Bertoni
Jul 29 '15 at 10:53
add ...
Extract substring in Bash
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If x is constant, the following parameter expansion performs substring extraction:
b=${a:12:5}
where 12 is the offset (zero-based) and 5 is the length
If the underscores around the digits are the only ones in the input, y...
Detecting when the 'back' button is pressed on a navbar
...lution any more. Worked at the time I first used this (it was iOS 10). But now I accidentally found it calmly stopped working (iOS 11). Had to switch to the "willMove(toParentViewController)" solution.
– Vitalii
Jan 24 '18 at 14:27
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关于php的socket初探 - PHP - 清泛IT论坛，有思想、有深度
...;global $errno, $errstr;
if ($port < 1024) {
die("Port must be a number which bigger than 1024/n");
}
&n...