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What is a plain English explanation of “Big O” notation?
...ned, you can mouse over the spoilers for minor sidenotes]
(with credit to https://stackoverflow.com/a/487292/711085 )
(technically the constant factor could maybe matter in some more esoteric examples, but I've phrased things above (e.g. in log(N)) such that it doesn't)
These are the bread-and-bu...
What is Lazy Loading?
...en not implemented in the most optimal way, lazy loading actually can slow down an application significantly.
– Captain Sensible
May 29 '12 at 15:37
1
...
Regular Expression for alphanumeric and underscores
...r expressions, and probably a lot of other languages as well.
Breaking it down:
^ : start of string
[ : beginning of character group
a-z : any lowercase letter
A-Z : any uppercase letter
0-9 : any digit
_ : underscore
] : end of character group
* : zero or more of the given characters
$ : end of s...
What are the relative strengths and weaknesses of Git, Mercurial, and Bazaar? [closed]
...ry fast, scales very well, and is very transparent about its concepts. The down side of this is that it has a relatively steep learning curve. A Win32 port is available, but not quite a first-class citizen. Git exposes hashes as version numbers to users; this provides guarantees (in that a single ha...
SQL exclude a column using SELECT * [except columnA] FROM tableA?
...elect say all data for a student for statistical exploration but not bring down the wire the student id itself to bolster privacy
– George Birbilis
Jul 11 '14 at 16:59
1
...
How to check if UILabel is truncated?
...a minimumFontSize for your label that allows the system to shrink the text down to that size. You may want to use sizeWithFont:minFontSize:actualFontSize:forWidth:lineBreakMode: in that case.
CGSize size = [label.text sizeWithAttributes:@{NSFontAttributeName:label.font}];
if (size.width > label...
Mac SQLite editor [closed]
...app on a device
Open iTunes
Select the device
Select the "Apps" tab
Scroll down to the "File Sharing" section and select the app
The .sqlite file should appear in the right hand pane - select it and "Save to..."
Once it's saved open it up in your favourite SQLITE editor
You can also edit it and co...
How to call a function from a string stored in a variable?
...ly the safest method being call_user_func() or if you must you can also go down the route of $function_name(). It is possible to pass arguments using both of these methods as so
$function_name = 'foobar';
$function_name(arg1, arg2);
call_user_func_array($function_name, array(arg1, arg2));
If th...
Creating a left-arrow button (like UINavigationBar's “back” style) on a UIToolbar
... Don't do this -- Your app will be rejected. Vote this answer down.
– thefaj
Jun 1 '11 at 15:11
4
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Memoization in Haskell?
...t above, but instead of taking linear time to find each node, can chase it down in logarithmic time.
The result is considerably faster:
*Main> fastest_f 12380192300
67652175206
*Main> fastest_f 12793129379123
120695231674999
In fact it is so much faster that you can go through and replace...