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Abusing the algebra of algebraic data types - why does this work?
...in a moment.
As you've probably noticed, Haskell tends to borrow concepts from Category Theory, and all of the above has a very straightforward interpretation as such:
Given objects A and B in Hask, their product A×B is the unique (up to isomorphism) type that allows two projections fst : A×B ...
How does Go compile so quickly?
...erating system has to load the whole VM, then they have to be JIT-compiled from bytecode to native code, all of which takes some time.
Speed of compilation depends on several factors.
Some languages are designed to be compiled fast. For example, Pascal was designed to be compiled using a single-pa...
How to filter files when using scp to copy dir recursively?
I need to copy all the .class files from server to local with all dir reserved. e.g. server:/usr/some/unknown/number/of/sub/folders/me.class will be /usr/project/backup/some/unknown/number/of/sub/folders/me.class the problem is, there are many other useless files such as .svn-base files that i d...
Handler vs AsyncTask
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From Honeycomb on, AsyncTasks are executed on one thread, so no parallelism anymore. You still could run them on a paralel Executor implementation.
– MrSnowflake
May 6 '13 at 15:27
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How do I check whether a file exists without exceptions?
...ffers an object-oriented approach (backported to pathlib2 in Python 2.7):
from pathlib import Path
my_file = Path("/path/to/file")
if my_file.is_file():
# file exists
To check a directory, do:
if my_file.is_dir():
# directory exists
To check whether a Path object exists independently ...
Subdomain on different host [closed]
...s a stupid question, but important for me. Will all the traffic have to go from main server connected to mydomain.com like a proxy or is it used only to redirect?
– Marek
Oct 24 '15 at 11:29
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Changing ImageView source
...Id(R.id.ImageView1)).setImageResource(0);
now this will delete the image from your image view, because it has set the resources value to zero.
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String comparison in Python: is vs. == [duplicate]
... I though that for checking if a string was modified (e.g. result returned from re.sub) comparing large strings for is equality instead of == would be faster. This was barely the case an timeit showed a mere 0.4% speed improvement. In my case it's not worth the risk that re.sub starts changing the s...
How can a web application send push notifications to iOS devices? [closed]
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as of 02/2016,FF,Chrome and Safari can register for push from webapp.
– Yvon Huynh
Feb 10 '16 at 9:56
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What is the difference between int, Int16, Int32 and Int64?
...ker and any others like myself who came here trying to decide which to use from a performance standpoint, you should check out this post that suggests Integer is more efficient than Int16 in many cases: stackoverflow.com/questions/129023/net-integer-vs-int16
– Tony L.
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