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Javascript reduce on array of objects
...a variable in the next iteration.
Iteration 1: a = {x:1}, b = {x:2}, {x: 3} assigned to a in Iteration 2
Iteration 2: a = {x:3}, b = {x:4}.
The problem with your example is that you're returning a number literal.
function (a, b) {
return a.x + b.x; // returns number literal
}
Iteration 1: ...
Pad a string with leading zeros so it's 3 characters long in SQL Server 2008
I have a string that is up to 3 characters long when it's first created in SQL Server 2008 R2.
17 Answers
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Understanding dict.copy() - shallow or deep?
...ed by value, but just creating a new reference.
>>> a = {1: [1,2,3]}
>>> b = a.copy()
>>> a, b
({1: [1, 2, 3]}, {1: [1, 2, 3]})
>>> a[1].append(4)
>>> a, b
({1: [1, 2, 3, 4]}, {1: [1, 2, 3, 4]})
In contrast, a deep copy will copy all contents by value....
How can I represent an 'Enum' in Python?
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43 Answers
43
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Python creating a dictionary of lists
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>>> d
defaultdict(<type 'list'>, {1: ['1'], 2: ['1', '2'], 3: ['2']})
>>> d.items()
[(1, ['1']), (2, ['1', '2']), (3, ['2'])]
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Access an arbitrary element in a dictionary in Python
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13 Answers
13
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How to make good reproducible pandas examples
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341
Note: The ideas here are pretty generic for Stack Overflow, indeed questions.
Disclaimer: Wri...
How can I index a MATLAB array returned by a function without first assigning it to a local variable
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386
It actually is possible to do what you want, but you have to use the functional form of the in...
How to change the order of DataFrame columns?
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34 Answers
34
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Add st, nd, rd and th (ordinal) suffix to a number
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358
The rules are as follows:
st is used with numbers ending in 1 (e.g. 1st, pronounced fir...