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Flatten an Array of Arrays in Swift
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Swift >= 3.0
reduce:
let numbers = [[1,2,3],[4],[5,6,7,8,9]]
let reduced = numbers.reduce([], +)
flatMap:
let numbers = [[1,2,3],[4],[5,6,7,8,9]]
let flattened = numbers.flatMap { $0 }
joined:
let numbers = [[1,2,3],[4],[5,6,7,8,9]]
let joined = Array(number...
`elif` in list comprehension conditionals
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259
Python's conditional expressions were designed exactly for this sort of use-case:
>>>...
Convert list of dictionaries to a pandas DataFrame
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edited Jul 22 at 17:24
cs95
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将 App Inventor 2 项目连接到外部传感器 · App Inventor 2 中文网
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将 App Inventor 2 项目连接到外部传感器
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将 App Inventor 2 项目连接到外部传感器
Note: This report describes work carried out in Spring 2014 for an Undergraduate A...
How can I remove an element from a list?
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227
I don't know R at all, but a bit of creative googling led me here: http://tolstoy.newcastle.ed...
Is Big O(logn) log base e?
...he derivation of the O() polynomial, in the case of binary search, only log2 is correct. I assume this distinction was the intuitive inspiration for your question to begin with.
Also, as a matter of my opinion, writing O(log2 N) is better for your example, because it better communicates the deriv...
Removing duplicate objects with Underscore for Javascript
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233
.uniq/.unique accepts a callback
var list = [{a:1,b:5},{a:1,c:5},{a:2},{a:3},{a:4},{a:3},{a:2...
How to get the Power of some Integer in Swift language?
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20 Answers
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Active
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Logging in Scala
...appers around a Java logging framework (slf4j, log4j etc), but as of March 2015, the surviving log libraries are all slf4j. These log libraries provide some sort of log object to which you can call info(...), debug(...), etc. I'm not a big fan of slf4j, but it now seems to be the predominant logging...
What does “hashable” mean in Python?
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answered Jan 26 '13 at 9:49
NPENPE
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