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lenses, fclabels, data-accessor - which library for structure access and mutation is better
...s _ s) = s
subject to three laws:
First, that if you put something, you can get it back out
get l (put l b a) = b
Second that getting and then setting doesn't change the answer
put l (get l a) a = a
And third, putting twice is the same as putting once, or rather, that the second put wins.
...
Is file append atomic in UNIX?
In general, what can we take for granted when we append to a file in UNIX from multiple processes? Is it possible to lose data (one process overwriting the other's changes)? Is it possible for data to get mangled? (For example, each process is appending one line per append to a log file, is it po...
Why does ContentResolver.requestSync not trigger a sync?
...g, and my sync works when I trigger it from the Dev Tools Sync Tester application, however when I call ContentResolver.requestSync(account, authority, bundle) from my ContentProvider, my sync is never triggered.
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Why do x86-64 instructions on 32-bit registers zero the upper part of the full 64-bit register?
...I'm not AMD or speaking for them, but I would have done it the same way. Because zeroing the high half doesn't create a dependency on the previous value, that the CPU would have to wait on. The register renaming mechanism would essentially be defeated if it wasn't done that way.
This way you can wr...
Why does git perform fast-forward merges by default?
... the 'no-ff' with its "checkpoint commits" that break bisect or blame, and carefully consider whether it should be your default approach for master.
(From nvie.com, Vincent Driessen, post "A successful Git branching model")
Incorporating a finished feature on develop
Finished features may...
Why does my application spend 24% of its life doing a null check?
I've got a performance critical binary decision tree, and I'd like to focus this question on a single line of code. The code for the binary tree iterator is below with the results from running performance analysis against it.
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Difference between rake db:migrate db:reset and db:schema:load
...:drop, db:setup
db:migrate:reset does db:drop, db:create, db:migrate
Typically, you would use db:migrate after having made changes to the schema via new migration files (this makes sense only if there is already data in the database). db:schema:load is used when you setup a new instance of your ap...
Declaring abstract method in TypeScript
...blished.
The makeSound method is marked as abstract, as is the class. You cannot directly instantiate an Animal now, because it is abstract. This is part of TypeScript 1.6, which is now officially live.
abstract class Animal {
constructor(protected name: string) { }
abstract makeSound(inp...
Why should I use core.autocrlf=true in Git?
...hat I know already contains some files with CRLF line-endings. As far as I can tell, there are two ways to deal with this:
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Running multiple commands with xargs
...e example above, xargs takes echo % as the command argument. But in some cases, I need multiple commands to process the argument instead of one. For example:
...