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Add new field to every document in a MongoDB collection
...: {"new_field": 1} },
false,
true
)
EDIT:
In the above example last 2 fields false, true specifies the upsert and multi flags.
Upsert: If set to true, creates a new document when no document matches the query criteria.
Multi: If set to true, updates multiple documents that meet the qu...
How to initialize all the elements of an array to any specific value in java
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218
If it's a primitive type, you can use Arrays.fill():
Arrays.fill(array, -1);
[Incidentally,...
How do you do natural logs (e.g. “ln()”) with numpy in Python?
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edited Sep 25 '13 at 14:03
Hooked
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Why does “while(true)” without “Thread.sleep” cause 100% CPU usage on Linux but not on Windows?
...s 100% and 4 cores are 400%.
With IRIX mode off, 1 fully utilized core is 25% and 4 cores are 100%.
This means that by default, top on Linux will show an infinite loop as ~100% and Windows will show it as ~25%, and it means exactly the same thing.
You can toggle IRIX mode while top is running w...
The application may be doing too much work on its main thread
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edited Nov 19 '19 at 19:24
answered Jan 15 '14 at 0:07
Jo...
Running Bash commands in Python
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328
Don't use os.system. It has been deprecated in favor of subprocess. From the docs: "This module...
How to use split?
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249
Documentation can be found e.g. at MDN. Note that .split() is not a jQuery method, but a nativ...
What are the sizes used for the iOS application splash screen?
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2018 Update - Please don't use this info !
I'm leaving the below post for reference purposes.
Please read Apple's documentation Human Interface Guidelines - Launch Screens for details on launch screens and recommendations.
Th...
How can I get all the request headers in Django?
... the HTTP headers alone, just filter by keys prefixed with HTTP_.
Update 2
could you show me how I could build a dictionary of headers by filtering out all the keys from the request.META variable which begin with a HTTP_ and strip out the leading HTTP_ part.
Sure. Here is one way to do it.
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Why can't my program compile under Windows 7 in French? [closed]
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62
votes
Many problems are due to caching, but yours is one of the other kind of hard ...