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How can I pass arguments to a batch file?
I need to pass an ID and a password to a batch file at the time of running rather than hardcoding them into the file.
17 An...
Get bitcoin historical data [closed]
...bitcoincharts.com/v1/csv/
it is updated twice a day for active exchanges, and there is a few dead exchanges, too.
EDIT: Since there are no column headers in the CSVs, here's what they are :
column 1) the trade's timestamp,
column 2) the price,
column 3) the volume of the trade
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What is the difference between new/delete and malloc/free?
What is the difference between new / delete and malloc / free ?
15 Answers
15
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Is it better to return null or empty collection?
... an empty enumerable/collection. It prevents the aforementioned nonsense, and prevents your car getting egged by co-workers and users of your classes.
When talking about properties, always set your property once and forget it
public List<Foo> Foos {public get; private set;}
public Bar() { ...
How is the AND/OR operator represented as in Regular Expressions?
...ou want to build a the regex dynamically to contain other words than part1 and part2, and that you want order not to matter. If so you can use something like this:
((^|, )(part1|part2|part3))+$
Positive matches:
part1
part2, part1
part1, part2, part3
Negative matches:
part1, //with ...
Access lapply index names inside FUN
... n=names(x))
Here I use lapply over the indices of x, but also pass in x and the names of x. As you can see, the order of the function arguments can be anything - lapply will pass in the "element" (here the index) to the first argument not specified among the extra ones. In this case, I specify y ...
How to define @Value as optional
... limited to plain strings as default values. You can use SPEL expressions, and a simple SPEL expression to return null is:
@Value("${myValue:#{null}}")
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No line-break after a hyphen
...t character in your jsfiddle, shrunk the frame down as small as it can go, and the line doesn't split there any more.
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JavaScript isset() equivalent
...l also evaluate to false if array.foo does exists but is false or 0 (and probably other values as well).
24 Answers
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How to sort two lists (which reference each other) in the exact same way
...rt(); zip(*tups)
100000 loops, best of 3: 2.84 us per loop
On the other hand, for larger lists, the one-line version could be faster:
>>> %timeit zip(*sorted(zip(list1, list2)))
100 loops, best of 3: 8.09 ms per loop
>>> %timeit tups = zip(list1, list2); tups.sort(); zip(*tups)
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