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When NOT to use yield (return) [duplicate]
...e O(n) in stack space. It is O(h) in heap space because each enumerator is allocated on the heap. (On implementations of C# I'm aware of; a conforming implementation might have other stack or heap space characteristics.)
But iterating a tree can be O(n) in time and O(1) in stack space. You can wr...
How do I calculate tables size in Oracle
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You might be interested in this query. It tells you how much space is allocated for each table taking into account the indexes and any LOBs on the table. Often you are interested to know "How much spaces the the Purchase Order table take, including any indexes" rather than just the table itsel...
Convert ArrayList to String[] array [duplicate]
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According to Joshua Bloch in Effective Java, preallocating the array harms performance. Provide a zero-length array instead. stockList.toArray(new String[0])
– Crashh
Mar 10 '18 at 3:20
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Run cURL commands from Windows console
...WARNING: This does NOT pass GET parameters to the page. I used this with a PHP page. curl https://www.example.com/mypage.php?action=hello. In the mypage.php script, $_GET['action'] is empty
– Stephen R
Jun 26 '19 at 0:31
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Virtual functions and performance - C++
...s 1st level cache with more memory than my first computer had? Not at all. Allocating memory from main RAM will cost you more time than if all your functions were virtual.
Its like the old, old days where people said structured programming was slow because all the code was split into functions, eac...
Select last row in MySQL
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Make it simply use: PDO::lastInsertId
http://php.net/manual/en/pdo.lastinsertid.php
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How to take screenshot of a div with JavaScript?
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If you wish to have "Save as" dialog, just pass image into php script, which adds appropriate headers
Example "all-in-one" script script.php
<?php if(isset($_GET['image'])):
$image = $_GET['image'];
if(preg_match('#^data:image/(.*);base64,(.*)$#s', $image, $match)){
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How many parameters are too many? [closed]
...umber of CPU registers, because anymore and the compiler will be forced to allocate them on the stack.
– Michaelangel007
Mar 31 '16 at 14:10
1
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How to construct a REST API that takes an array of id's for the resources
...ry parameters will be combined into an array. With the above query string, PHP happens to tell you that id equals [1, 2, 3], but Ruby on Rails tells you it equals 3, and other frameworks may also act differently, e.g. saying id equals 1. URLs like …?id=1,2,3 avoid this potential for confusion.
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Placeholder in UITextView
...at const UI_PLACEHOLDER_TEXT_CHANGED_ANIMATION_DURATION = 0.25;
- (void)dealloc
{
[[NSNotificationCenter defaultCenter] removeObserver:self];
#if __has_feature(objc_arc)
#else
[_placeHolderLabel release]; _placeHolderLabel = nil;
[_placeholderColor release]; _placeholderColor = nil;
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