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How do you create a random string that's suitable for a session ID in PostgreSQL?
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random() gets called length times (like in many of the other solutions). Is there a more efficient way to choose from 62 characters each time? How does this perform compared to md5()?
– ma11hew28
Feb 1...
git diff file against its last change
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This does exist, but it's actually a feature of git log:
git log -p [--follow] [-1] <path>
Note that -p can also be used to show the inline diff from a single commit:
git log -p -1 <commit>
Options used:
-p (also -u or --patch) is hidd...
instanceof Vs getClass( )
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@overexchange - You cannot validly infer that all use of instanceof (for example) is bad design. There are situations where it may be the best solution. Same for getClass(). I will repeat that I said "overuse" and not "use". Every case needs to be judged on its merit...
Associativity of “in” in Python?
I'm making a Python parser, and this is really confusing me:
4 Answers
4
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Clean ways to write multiple 'for' loops
For an array with multiple dimensions, we usually need to write a for loop for each of its dimensions. For example:
16 An...
Shell script to delete directories older than n days
..., you can replace the ; with + and it will do the equivalent of the xargs call for you, passing as many files as will fit on each exec system call:
find . -type d -ctime +10 -exec rm -rf {} +
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Highlight a word with jQuery
I basically need to highlight a particular word in a block of text. For example, pretend I wanted to highlight the word "dolor" in this text:
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Is it safe to shallow clone with --depth 1, create commits, and pull updates again?
...ọc Duy (pclouds):
Now that git supports data transfer from or to a shallow clone, these limitations are not true anymore.
The documentation now reads:
--depth <depth>::
Create a 'shallow' clone with a history truncated to the specified number of revisions.
That stems from commi...
Design Patterns: Abstract Factory vs Factory Method
...uct method sits within a different class?
– Peter O'Callaghan
Dec 18 '11 at 16:58
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Wouldn't it b...
UnboundLocalError on local variable when reassigned after first use
... The variable scope decision is made by the compiler, which normally runs once when you first start the program. However it is worth keeping in mind that the compiler might also run later if you have "eval" or "exec" statements in your program.
– Greg Hewgill
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