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What are the differences between Deferred, Promise and Future in JavaScript?
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edited Oct 4 '18 at 17:42
Alexis Wilke
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Eclipse compilation error: The hierarchy of the type 'Class name' is inconsistent
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edited May 12 '14 at 12:37
answered Dec 15 '11 at 12:32
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Remove rows with duplicate indices (Pandas DataFrame and TimeSeries)
...subset='index', keep='first').set_index('index')
1000 loops, best of 3: 1.54 ms per loop
>>> %timeit df3.groupby(df3.index).first()
1000 loops, best of 3: 580 µs per loop
>>> %timeit df3[~df3.index.duplicated(keep='first')]
1000 loops, best of 3: 307 µs per loop
Note that you ...
how to access iFrame parent page using jquery?
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496
To find in the parent of the iFrame use:
$('#parentPrice', window.parent.document).html();
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Modify table: How to change 'Allow Nulls' attribute from not null to allow null
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-- replace NVARCHAR(42) with the actual type of your column
ALTER TABLE your_table
ALTER COLUMN your_column NVARCHAR(42) NULL
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Mockito How to mock and assert a thrown exception?
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74
BDD Style Solution (Updated to Java 8)
Mockito alone is not the best solution for handling exce...
What is The Rule of Three?
...r class X calls the destructors for X's direct [...] members
[n3126.pdf 12.4 §6]
Managing resources
So when should we declare those special member functions explicitly?
When our class manages a resource, that is,
when an object of the class is responsible for that resource.
That usually means the ...
How do I create a URL shortener?
...ou just do a reverse lookup in your alphabet.
e9a62 will be resolved to "4th, 61st, and 0th letter in the alphabet".
e9a62 = [4,61,0] = 4×622 + 61×621 + 0×620 = 1915810
Now find your database-record with WHERE id = 19158 and do the redirect.
Example implementations (provided by commenters)
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Creating an R dataframe row-by-row
...de in R.
If you can, allocate your entire data.frame up front:
N <- 1e4 # total number of rows to preallocate--possibly an overestimate
DF <- data.frame(num=rep(NA, N), txt=rep("", N), # as many cols as you need
stringsAsFactors=FALSE) # you don't know levels yet...
if A vs if A is not None:
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answered Oct 19 '11 at 4:09
Greg HewgillGreg Hewgill
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