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Why is an array not assignable to Iterable?
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Arrays can implement interfaces (Cloneable and java.io.Serializable). So why not Iterable? I guess Iterable forces adding an iterator method, and arrays don't implement methods. char[] doesn't even override toString. Anyway, arrays of references should be considered l...
What Every Programmer Should Know About Memory?
... fundamental concepts about memory: how CPU cache works, what are physical and virtual memory and how Linux kernel deals that zoo. Probably there are outdated API references in some examples, but it doesn't matter; that won't affect the relevance of the fundamental concepts.
So, any book or article...
How to store a command in a variable in a shell script?
I would like to store a command to use at a later period in a variable (not the output of the command, but the command itself)
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How do I recursively delete a directory and its entire contents (files + sub dirs) in PHP?
How do I delete a directory and its entire contents (files and subdirectories) in PHP?
21 Answers
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Replace values in list using Python [duplicate]
...ns ± 13.6 ns per loop (mean ± std. dev. of 7 runs, 1000000 loops each)
And Python 2.7.6 timings:
In [1]: %%timeit
...: items = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
...: for index, item in enumerate(items):
...: if not (item % 2):
...: items[index] = None
...:
1000000 l...
Difference between jQuery parent(), parents() and closest() functions
...ches the selector, up
from the DOM tree. Begins from the current element and travels up.
parent() selects one element up (single level up) the DOM tree.
parents() method is similar to parent() but selects all the
matching elements up the DOM tree. Begins from the parent element and tr...
Get operating system info
...ing system info. I have not been able to find out how to do that with PHP, and wanted to try to figure it out.
7 Answers
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How to Loop through items returned by a function with ng-repeat?
...ope for all watches $digest runs it, gets current value (watch.get(scope)) and compares it to watch.last. If current value is not equal to watch.last (always for first compare) $digest sets dirty to true. When all scopes are processed if dirty == true $digest starts another depth-first traversal fro...
Possible to do a MySQL foreign key to one of two possible tables?
...table.
Polymorphic Associations are supported by frameworks such as Rails and Hibernate. But they explicitly say that you must disable SQL constraints to use this feature. Instead, the application or framework must do equivalent work to ensure that the reference is satisfied. That is, the value ...
PersistentObjectException: detached entity passed to persist thrown by JPA and Hibernate
... to the corresponding getters. A big word of caution is not to mix "Field" and "Property" access types within the entity class otherwise the behavior is undefined by the JSR-317 specifications.
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