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Shallow copy of a Map in Java
...ap here, but it works for every implementation of the Map interface
Map<String, Object> data = new HashMap<String, Object>();
Map<String, Object> shallowCopy = new HashMap<String, Object>();
shallowCopy.putAll(data);
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How to open a file for both reading and writing?
...ontent after the specified number of bytes. Imagine that your file has the string Hello, world and you write Bye. If you don't truncate() the content at the end will be Byelo, world, since you never deleted the text that existed in the file. truncate() truncates the file to the current fp.
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What is the difference between `raise “foo”` and `raise Exception.new(“foo”)`?
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From the offical documentation:
raise
raise( string )
raise( exception [, string [, array ] ] )
With no arguments, raises the exception in $! or raises a RuntimeError if $! is nil. With a single String argument, it raises a RuntimeError with the string as a message. O...
Adding a directory to $LOAD_PATH (Ruby)
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Also, it's a lot harder to Google for strings like "$:" that contain only symbols.
– DSimon
Apr 19 '12 at 3:39
add a comment
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How to convert list of tuples to multiple lists?
...xs, ys
if __name__ == '__main__':
from timeit import timeit
setup_string='''\
N = 2000000
xs = list(range(1, N))
ys = list(range(N+1, N*2))
zs = list(zip(xs, ys))
from __main__ import t1, t2, t3
'''
print(f'zip:\t\t{timeit('t1(zs)', setup=setup_string, number=1000)}')
print(f'append...
Hyphen, underscore, or camelCase as word delimiter in URIs?
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any convention for the queryString, for instance ?event_id=1 or ?eventId=1???
– user2727195
Oct 7 '15 at 23:21
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How to include a child object's child object in Entity Framework 5
...rload of the Include() method which takes a lambda expression instead of a string. You can then Select() over children with Linq expressions rather than string paths.
return DatabaseContext.Applications
.Include(a => a.Children.Select(c => c.ChildRelationshipType));
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RabbitMQ message size and types
...conditions:
The thing you are sending can be converted to and from a bytestring
The consumer knows exactly what it is getting and how to convert it to the original object
Strings are pretty easy, they have a built in method for converting to and from bytes. If you know it is a string then you ...
How to compare variables to undefined, if I don’t know whether they exist? [duplicate]
...a valid variable, do something here.
}
Note that typeof always returns a string, and doesn't generate an error if the variable doesn't exist at all.
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How do I sort a list of dictionaries by a value of the dictionary?
... is rather hackish, since it relies on converting the values into a single string representation for comparison, but it works as expected for numbers including negative ones (although you will need to format your string appropriately with zero paddings if you are using numbers).
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