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Understanding reference counting with Cocoa and Objective-C
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Let's start with retain and release; autorelease is really just a special case once you understand the basic concepts.
In Cocoa, each object keeps track of how many times it is being referenced (specifically, the NSObject base c...
Common MySQL fields and their appropriate data types
... Plus it's just wrong. Someone much wiser than me told me when I was starting out that (with databasing) just because something looks like a number doesn't mean it is or should be treated as such...
– da5id
Dec 10 '08 at 1:07
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How to un-submodule a Git submodule?
...bmodule_origin git://url/to/submodule/origin
git fetch submodule_origin
# Start a fake merge (won't change any files, won't commit anything)
git merge -s ours --no-commit submodule_origin/master
# Do the same as in the first solution
git rm --cached submodule_path # delete reference to submodule H...
Reordering of commits
...her branches, rather than merging, since merges are straightforward. Let's start by manipulating branch A.
git rebase -i <SHA1 of commit a>^ branchA
The ^ means the previous commit, so this command says to rebase branch A using the commit before "a" as the base. Git will present you with a ...
Most efficient way to store thousand telephone numbers
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Additional space can be saved by observing that none of our numbers can start with e.g. 1111111(binary), because the lowest number that starts with that is 130048 and we have only five decimal digits. This allows us to shave a few entries off the first block of memory: instead of 2^m - 1 counts, ...
What characters are valid for JavaScript variable names?
...my write-up summarizing the relevant spec sections:
An identifier must start with $, _, or any character in the Unicode categories “Uppercase letter (Lu)”, “Lowercase letter (Ll)”, “Titlecase letter (Lt)”, “Modifier letter (Lm)”, “Other letter (Lo)”, or “Letter number (Nl)...
Sleep until a specific time/date
... then assign this expression to a value, and sleep for that many seconds:
startTime=$(date +%s)
endTime=$(date -d "next week" +%s)
timeToWait=$(($endTime- $startTime))
sleep $timeToWait
All done!
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What's the difference between “Write-Host”, “Write-Output”, or “[console]::WriteLine”?
...his video of Jeffrey Snover explaining how the pipeline works. Back when I started learning PowerShell I found this to be the most useful explanation of how the pipeline works.
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How to disable HTML links
... well supported only by Chrome, FireFox and Opera (19+). Internet Explorer started to support this from version 11 but not for links however it's available in an outer element like:
span.disable-links {
pointer-events: none;
}
With:
<span class="disable-links"><a href="#">...<...
Create Generic method constraining T to an Enum
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What I'd really like to know is why the C# team hasn't started allowing this yet, since it is already supported by MSIL.
– MgSam
Sep 19 '12 at 0:30
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