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How to change the Content of a with Javascript
...he textArea element.
Here's the MDN reference
value DOMString The raw value contained in the control.
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How to generate a random number in C++?
... with implementation-defined algorithm. Function rand() produces values in range [0, RAND_MAX].
Quote from C11 standard (ISO/IEC 9899:2011):
The srand function uses the argument as a seed for a new sequence of
pseudo-random numbers to be returned by subsequent calls to rand. If
srand is then called...
How to remove multiple indexes from a list at the same time? [duplicate]
...indices]
Example:
In [9]: remove_indices = [1,2,3]
In [10]: somelist = range(10)
In [11]: somelist = [i for j, i in enumerate(somelist) if j not in remove_indices]
In [12]: somelist
Out[12]: [0, 4, 5, 6, 7, 8, 9]
shar...
MySQL vs MongoDB 1000 reads
...index, we can assume that the values for the root row are in the index
20+ range lookups (hopefully on an index) for the entity's pk value
These probably aren't clustered indexes, so the same 20+ data lookups once we figure out what the appropriate child rows are.
So the total for mysql, even assu...
Is the “struct hack” technically undefined behavior?
...des in the list of undefined behavior:
An array subscript is out of range, even if an object is apparently accessible with the given subscript (as in the lvalue expression a[1][7] given the declaration int a[4][5]) (6.5.6).
Paragraph 8 of Section 6.5.6 Additive operators has another ment...
Compile time string hashing
...rent" hashes in std, so you cannot (without creating a std::string) hash a raw character buffer as a std::string.
I stuck the std::string custom hasher (with transparent const char* support) into a my_hash namespace, so you can store it in a std::unordered_map if you need consistency.
Based off of...
Differences between INDEX, PRIMARY, UNIQUE, FULLTEXT in MySQL?
... your data so they are used only for access - for quickly reaching certain ranges of records without scanning all records.
UNIQUE refers to an index where all rows of the index must be unique. That is, the same row may not have identical non-NULL values for all columns in this index as another row...
How to print a string in fixed width?
... your combinations in one line with:
>>> [''.join(perm) for i in range(1, len(s)) for perm in it.permutations(s, i)]
['a', 'b', 'c', 'd', 'ab', 'ac', 'ad', 'ba', 'bc', 'bd', 'ca', 'cb', 'cd', 'da', 'db', 'dc', 'abc', 'abd', 'acb', 'acd', 'adb', 'adc', 'bac', 'bad', 'bca', 'bcd', 'bda', 'bd...
How do you convert epoch time in C#?
...someone is using. Seconds used to be good enough, and gave us a reasonable range either side of The Epoch in signed 32-bit values. (And is why just after 3:14 a.m. on Jan 19th, 2038 GMT might be a bad time for some...) Using milliseconds is a more modern practice thanks to our routinely being able t...
How to stop a goroutine
...routine is more idiomatically written using defer to call wg.Done(), and a range ch loop to iterate over all values until the channel is closed.
– Alan Donovan
Jul 16 '15 at 13:53
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