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When should I use Write-Error vs. Throw? Terminating vs. non-terminating errors
... scripts, $ErrorActionPreference = "Stop" is a recommended setting to fail fast.
"PowerShell’s default behaviour with respect to errors, which is to
continue on error ...feels very VB6 “On Error Resume Next”-ish"
(from http://codebetter.com/jameskovacs/2010/02/25/the-exec-problem/)
Ho...
What's the difference between echo, print, and print_r in PHP?
...an take multiple parameters, although such usage is rare; echo is slightly faster than print. (Personally, I always use echo, never print.)
var_dump prints out a detailed dump of a variable, including its type and the type of any sub-items (if it's an array or an object). print_r prints a variable ...
Has reCaptcha been cracked / hacked / OCR'd / defeated / broken? [closed]
...y, many, many times. And so they needed to be able to enter captcha’s as fast as they could. They developed a set of guidelines that allowed them to quickly decide which reCAPTCHA words they could skip. For example:
You will be given 2 words: 1 real, 1 fake.
For [REAL FAKE] or [...
NSOperation vs Grand Central Dispatch
...
@VolureDarkAngel - GCD is extremely fast at handling dispatches like that. It shouldn't be your bottleneck in a situation like you describe, unless you somehow back up a pile of updates into a queue due to slow I/O accesses or something of the sort. That's prob...
Best way to define private methods for a class in Objective-C
...d
Another approach which may not be obvious: a C++ type can be both very fast and provide a much higher degree of control, while minimizing the number of exported and loaded objc methods.
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What are bitwise operators?
...patterns or binary numerals at the level of their individual bits. It is a fast, primitive action directly supported by the processor, and is used to manipulate values for comparisons and calculations.
operations:
bitwise AND
bitwise OR
bitwise NOT
bitwise XOR
etc
List item
AND|0 1 ...
Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_general_ci,IMPLICIT) for operation '=
... the other hand, option 4 can take advantages of possible index and led to fast queries.
In the picture below, you can see the same query being run after applied Option 4, aka altering the schema/table/column collation.
Visual Query Explanation after the collation has been changed, and therefore w...
How to append something to an array?
... the following:
Firefox 3.6 (Mac):
Small arrays: arr[arr.length] = b is faster (300ms vs. 800ms)
Large arrays: arr.push(b) is faster (500ms vs. 900ms)
Safari 5.0 (Mac):
Small arrays: arr[arr.length] = b is faster (90ms vs. 115ms)
Large arrays: arr[arr.length] = b is faster (160ms vs. 185ms)
...
How to manage local vs production settings in Django?
...ith complex solutions when simply having two settings files feels easy and fast.
When you use mod_python/mod_wsgi for your Django project you need to point it to your settings file. If you point it to app/settings_local.py on your local server and app/settings_production.py on your production serve...
Simple calculations for working with lat/lon and km distance?
...do these calculations exactly, using some amusingly complicated (but still fast) trigonometry:
http://www.jstott.me.uk/jcoord/
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