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扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...ition
Introduction
MIT App Inventor is a block-based event-driven web platform that allows everyone, especially novices, to start programming and building fully functional apps for Android devices. Instead of text-based programming, apps are programmed by Blockly, a visual block-based programming f...
OAuth 2.0: Benefits and use cases — why?
...ss token as part of the request (as a query argument, HTTP header, or POST form data).
If the content service is accessed only over SSL, we're done. If it's available via plain HTTP, we'd like to protect that permanent access token in some way. Anyone sniffing the connection would be able to get ac...
What do Clustered and Non clustered index actually mean?
...gine a big room with many tables in it. You can either put these tables to form several rows or pull them all together to form a big conference table, but not both ways at the same time. A table can have other indexes, they will then point to the entries in the clustered index which in its turn will...
Code Golf: Lasers
...dish s///e with side effects. In the golfed code, the tr is written in the form y''' which allows me to skip backslashing one backslash.
die "true\n" if />x/; die "false\n" if />#/;
Terminate with the right message if we hit the target or a wall.
$s = $1 if s/>(.)/$s$d{$1}/;
If there'...
How do I tell Maven to use the latest version of a dependency?
... Maven super POM. You can do this with either "-Prelease-profile" or "-DperformRelease=true"
It's worth emphasising that any approach that allows Maven to pick the dependency versions (LATEST, RELEASE, and version ranges) can leave you open to build time issues, as later versions can have differe...
ServiceStack vs ASP.Net Web API [closed]
...ctices remote services
ServiceStack has a primary focus on simplicity, performance and in promoting web/remote service best-practices centered around embracing Martin Fowlers remote-service design patterns in as idiomatic C# as possible:
The Facade Pattern - Which suggests the usage of batchful, ...
What is in your Mathematica tool bag? [closed]
...;/@x, _, h][[2]];
This allows me to group lists by any criteria and transform them in the process. The way it works is that a criteria function (f) tags each item in the list, each item is then transformed by a second supplied function (g), and the specific output is controlled by a third functio...
Generate random integers between 0 and 9
...
Try this:
from random import randrange, uniform
# randrange gives you an integral value
irand = randrange(0, 10)
# uniform gives you a floating-point value
frand = uniform(0, 10)
share
...
Is file append atomic in UNIX?
...l also need to call fsync(2) after every write, but that's terrible for performance.
Clarification: read the comments and Oz Solomon's answer. I'm not sure that O_APPEND is supposed to have that PIPE_BUF size atomicity. It's entirely possible that it's just how Linux implemented write(), or it may ...
Which is faster: while(1) or while(2)?
...rt(7);
}
while(x()) {}
At -O0, these two examples actually call x and perform a comparison for each iteration.
First example (returning 1):
.L4:
call x
testl %eax, %eax
jne .L4
movl $0, %eax
addq $32, %rsp
popq %rbp
ret
.seh_endproc
.ident "GCC: (...