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How do you know when to use fold-left and when to use fold-right?
...eaning trees and fold-right produces right-leaning trees, but when I reach for a fold, I sometimes find myself getting bogged down in headache-inducing thought trying to determine which kind of fold is appropriate. I usually end up unwinding the entire problem and stepping through the implementatio...
Multi-line regex support in Vim
I notice the standard regex syntax for matching across multiple lines is to use /s, like so:
1 Answer
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back button callback in navigationController in iOS
...iew automatically. I want to do a few things when back button is pressed before popping the view off the stack. Which is the back button callback function?
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How do you add a Dictionary of items into another Dictionary
... add the contents of one Array to another. Is there an easy way to do that for a dictionary?
28 Answers
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Checking for empty queryset in Django
What is the recommended idiom for checking whether a query returned any results?
Example:
7 Answers
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Find current directory and file's directory [duplicate]
...g directory use
import os
cwd = os.getcwd()
Documentation references for the modules, constants and functions used above:
The os and os.path modules.
The __file__ constant
os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountere...
How do I avoid capturing self in blocks when implementing an API?
...) and so the pair of objects will leak into the heap, occupying memory but forever unreachable without a debugger. Tragic, really.
That case could be easily fixed by doing this instead:
id progressDelegate = self.delegate;
self.progressBlock = ^(CGFloat percentComplete) {
[progressDelegate pro...
Resumable downloads when using PHP to send the file?
We are using a PHP scripting for tunnelling file downloads, since we don't want to expose the absolute path of downloadable file:
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Read file from line 2 or skip header row
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with open(fname) as f:
next(f)
for line in f:
#do something
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How do you use version control with Access development?
...od amount of VBA, a number of queries, a small amount of tables, and a few forms for data entry & report generation. It's an ideal candidate for Access.
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