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Difference between local and global indexes in DynamoDB
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Here is the formal definition from the documentation:
Global secondary index — an index with a hash and range key that can
be different from those on the table. A global secondary index is
considered "global" because queries on the index can spa...
Do the JSON keys have to be surrounded by quotes?
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You are correct to use strings as the key. Here is an excerpt from RFC 4627 - The application/json Media Type for JavaScript Object Notation (JSON)
2.2. Objects
An object structure is represented as a pair of curly brackets
surrounding zero or more name/value pairs (or memb...
How to remove leading and trailing white spaces from a given html string?
...d be sample code in JavaScript to remove leading and trailing white spaces from this string?
7 Answers
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Java: difference between strong/soft/weak/phantom reference
...is useful only to know exactly when an object has been effectively removed from memory: normally they are used to fix weird finalize() revival/resurrection behavior, since they actually do not return the object itself but only help in keeping track of their memory presence.
Weak Reference Objects a...
Why use AJAX when WebSockets is available?
...curity, parallelism, error handling, etc). Regarding performance, although from-scratch raw large file transfer speed would be similar, browsers have had years to finely tune caching of web content (much of which applies to AJAX requests) so in practice, switching from AJAX to WebSockets is unlikely...
Should all Python classes extend object?
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In Python 2, not inheriting from object will create an old-style class, which, amongst other effects, causes type to give different results:
>>> class Foo: pass
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>>> type(Foo())
<type 'instance'>
vs.
>>> class Ba...
Difference between abstraction and encapsulation?
.... The only thing that has to change is the compare function, which differs from data type to data type. qsort therefore expects the user to provide said compare function as a function argument.
Encapsulation and abstraction go hand in hand so much so that you could make the point that they are tru...
Should flux stores, or actions (or both) touch external services?
... former approach), I believe that stores should be dumb recipients of data from the actions, and that asynchronous processing of writes should live in the action creators. (Async reads can be handled differently.) In my experience, this has a few benefits, in order of importance:
Your stores becom...
How to convert SSH keypairs generated using PuTTYgen (Windows) into key-pairs used by ssh-agent and
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This answer was the key to getting ssh from the windows command line using passwordless keys for me (specifically for git access). Would have saved me hours of pain if I had seen it earlier! Thanks!
– cori
Jan 25 '13 at 12:20...
What's the simplest way to subtract a month from a date in Python?
... 0, 0)
Edit Corrected to handle the day as well.
Edit See also the answer from puzzlement which points out a simpler calculation for d:
d = min(date.day, calendar.monthrange(y, m)[1])
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