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Why is Go so slow (compared to Java)?
...shed as the benchmarks game - shootout.alioth.debian.org/flawed-benchmarks.php
– igouy
Apr 24 '10 at 17:24
...
Apache Prefork vs Worker MPM
...he earlier, threadsafe model. Worker is multi-threaded, and event supports php-mpm which is supposed to be a better system for handling threads and requests.
However, your results may vary, based on configuration. I've seen a lot of instability in php-mpm and not any speed improvements. An aggress...
querySelector and querySelectorAll vs getElementsByClassName and getElementById in JavaScript
...Selector takes more time than getElementById, like here dimlucas.com/index.php/2016/09/17/… . What if we take access time into account? Does the live node obtained from getElementById take more time than the static one from querySelector?
– Eric
Nov 16 '17 at...
Check if a program exists from a Makefile
... PATH")))
Note the use of the := assignment operator that is required in order to force immediate evaluation of the RHS expression. If your Makefile changes the PATH, then instead of the last line above you will need:
$(if $(shell PATH=$(PATH) which $(exec)),some string,$(error "No $(exec...
How to use the pass statement?
... In such cases, the block may contain pass in addition to the docstring in order to say “This is indeed intended to do nothing.”, for example in pebl:
class ParsingError(Exception):
"""Error encountered while parsing an ill-formed datafile."""
pass
In some cases, pass is used as a pla...
What is the difference between a strongly typed language and a statically typed language?
...but it will never refer to an Integer or a List. That's static typing.
In PHP:
$s = "abcd"; // $s is a string
$s = 123; // $s is now an integer
$s = array(1, 2, 3); // $s is now an array
$s = new DOMDocument; // $s is an instance of the DOMDocument class
That's dynamic typi...
Iterating over all the keys of a map
...
As a possible gotcha, note that the order of the iteration is undefined. groups.google.com/d/msg/golang-nuts/YfDxpkI34hY/4pktJI2ytusJ
– mna
Sep 22 '12 at 2:18
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Underscore: sortBy() based on multiple attributes
...inds that John and Lisa have the same room number it will keep them in the order it found them, which the first sortBy set to "Lisa, John".
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实时开发、测试和调试工具 · App Inventor 2 中文网
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Android 日志和 adb（高级）
如果你在 Android 设备上遇到问题，有时可以通过检查 Android 日志来获取信息。 例如，如果你的应用程序空间不足，则会记录在日志中。 日志中的消息通常难以理解，但是你可以使用通知程序组件使你...
How to wait for several Futures?
... fail, whereas with for comprehension you get the first error in traversal order of the input collection (even if another one failed first). For example:
val f1 = Future { Thread.sleep(1000) ; 5 / 0 }
val f2 = Future { 5 }
val f3 = Future { None.get }
Future.sequence(List(f1,f2,f3)).onFailure{case...