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Performance of Arrays vs. Lists
...
Very easy to measure...
In a small number of tight-loop processing code where I know the length is fixed I use arrays for that extra tiny bit of micro-optimisation; arrays can be marginally faster if you use the indexer / for form - but IIRC believe it dep...
Using awk to remove the Byte-order mark
...
Using GNU sed (on Linux or Cygwin):
# Removing BOM from all text files in current directory:
sed -i '1 s/^\xef\xbb\xbf//' *.txt
On FreeBSD:
sed -i .bak '1 s/^\xef\xbb\xbf//' *.txt
Advantage of using GNU or FreeBSD sed: the -i parameter means "in place", and will update files ...
Inline SVG in CSS
...possible. I just went to the standard specification and stated it was virtually impossible, which turned out to be a mistake (sort of)
– toniedzwiedz
May 26 '12 at 19:05
18
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Reference: What is variable scope, which variables are accessible from where and what are “undefined
... be in the global scope in a.php doesn't necessarily mean they are, it actually depends on which context that code is included/executed in.
What about functions inside functions and classes?
Every new function declaration introduces a new scope, it's that simple.
(anonymous) functions inside func...
When to use the JavaScript MIME type application/javascript instead of text/javascript?
...sniffing on the script to determine type (I'm not sure if any browsers actually do this though);
b. browsers use other information—the including page's encoding and in some browsers the script charset attribute—to determine the charset. So any proxy that tried to transcode the resource would br...
How to Compare Flags in C#?
...ed answer:
public Boolean HasFlag(Enum flag) {
if (!this.GetType().IsEquivalentTo(flag.GetType())) {
throw new ArgumentException(
Environment.GetResourceString(
"Argument_EnumTypeDoesNotMatch",
flag.GetType(),
this.GetType())...
Calculating sum of repeated elements in AngularJS ng-repeat
...to this is that it iterates over the collection twice. this is fine for small collections, but what if the collection is rather large? it seems like in ng-repeat there should be a way to have a running sum on a given object field.
– icfantv
Aug 6 '14 at 16:14...
How to launch an Activity from another Application in Android
...GORY_LAUNCHER. Returns null if neither are found."
– quietmint
Jun 2 '15 at 17:05
...
Select by partial string from a pandas DataFrame
...egex search is not required, so specify regex=False to disable it.
#select all rows containing "foo"
df1[df1['col'].str.contains('foo', regex=False)]
# same as df1[df1['col'].str.contains('foo')] but faster.
col
0 foo
1 foobar
Performance wise, regex search is slower than substring s...
Apple Pay入华遇阻 只因BAT太受欢迎？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...易规模的提升确实十分明显，在去年第四季度，微信和手Q带来的订单量就占到了京东的20%。不过能得到微信入口的企业并不多，就连滴滴和点评也被隐藏在了三级入口里，其他商户更是很难享受微信的入口红利。不过基于社交...