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How to check if an NSDictionary or NSMutableDictionary contains a key?
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edited Feb 18 '13 at 22:56
s4y
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answered May...
Is there a VB.NET equivalent for C#'s '??' operator?
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edited Feb 12 '19 at 19:14
djv
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ans...
Importing data from a JSON file into R
...omJSON(paste(readLines(json_file), collapse=""))
Update: since version 0.2.1
json_data <- fromJSON(file=json_file)
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Find the closest ancestor element that has a specific class
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edited Jul 2 '17 at 11:42
answered Nov 20 '14 at 10:43
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Python Sets vs Lists
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236
It depends on what you are intending to do with it.
Sets are significantly faster when it com...
How to migrate/convert from SVN to Mercurial (hg) on windows
...bversion Command-Line Client.
<Enable Convert Extension w/ Tortoise Hg 2>
Many thanks to bgever for pointing out in the comments that with TortoiseHg 2.0, enabling the convert extension is easier than ever. As he says
With TortoiseHG 2.0 this has been made
much simpler: Start the Tort...
How to add an empty column to a dataframe?
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>>> import pandas as pd
>>> df = pd.DataFrame({"A": [1,2,3], "B": [2,3,4]})
>>> df
A B
0 1 2
1 2 3
2 3 4
>>> df["C"] = ""
>>> df["D"] = np.nan
>>> df
A B C D
0 1 2 NaN
1 2 3 NaN
2 3 4 NaN
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How to sum up elements of a C++ vector?
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442
Actually there are quite a few methods.
int sum_of_elems = 0;
C++03
Classic for loop:
for(...
Linq style “For Each” [duplicate]
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288
Using the ToList() extension method is your best option:
someValues.ToList().ForEach(x => ...