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How can I quickly sum all numbers in a file?
...92
real 0m0.445s
user 0m0.438s
sys 0m0.024s
$ time { s=0;while read l; do s=$((s+$l));done<random_numbers;echo $s; }
16379866392
real 0m9.309s
user 0m8.404s
sys 0m0.887s
$ time { s=0;while read l; do ((s+=l));done<random_numbers;echo $s; }
16379866392
real 0m7.191s
...
Copy entire contents of a directory to another using php
... $dir = opendir($src);
@mkdir($dst);
while(false !== ( $file = readdir($dir)) ) {
if (( $file != '.' ) && ( $file != '..' )) {
if ( is_dir($src . '/' . $file) ) {
recurse_copy($src . '/' . $file,$dst . '/' . $file);
}
...
Java 8 Iterable.forEach() vs foreach loop
... an optimization, but critical when you consider that some sequences (like reading the lines in a file) may have side-effects, or you may have an infinite sequence."
Might execute in parallel, which is a horrible, horrible thing for all but the 0.1% of your code that needs to be optimized. Any para...
获取文件系统映像及恢复删除的数据（FAT文件系统格式描述） - C/C++ - 清泛...
... , MAX_PATH);
dumpPath.append(index);
//opening mass storage for reading
//requires administrator privilege
HANDLE hDump( ::Create File (
dumpPath.c_str(),
GENERIC_READ,
FILE _SHARE_READ | FILE _SHARE_WRITE,
NULL,
OPEN_EXISTING,
...
How to change an element's title attribute using jQuery
...o equivalent property to supplement it. Since title does indeed exist as a read/write property on many HTMLElements, we should take advantage of it.
You can read more about the difference between attributes and properties here or here.
With this in mind, let's manipulate that title...
Get or Set...
Use of var keyword in C#
...
I still think var can make code more readable in some cases. If I have a Customer class with an Orders property, and I want to assign that to a variable, I will just do this:
var orders = cust.Orders;
I don't care if Customer.Orders is IEnumerable<Order>...
How to make shallow git submodules?
....20 (Q4 2018) improves on the submodule support, which has been updated to read from the blob at HEAD:.gitmodules when the .gitmodules file is missing from the working tree.
See commit 2b1257e, commit 76e9bdc (25 Oct 2018), and commit b5c259f, commit 23dd8f5, commit b2faad4, commit 2502ffc, commit ...
can you host a private repository for your organization to use with npm?
...n set your internal CouchDB as the registry config, then you'll be able to read any published packages, in addition to your private ones, and by default will only publish internally. If you then want to publish a package for the whole world to see, you can simply override the --registry config for t...
R command for setting working directory to source file location in Rstudio
...uments/proyect1").
Once you set that, you can navigate to a subdirectory: read.csv("DATA/mydata.csv"). Is the same as read.csv("D:/Documents/proyect1/DATA/mydata.csv").
If you want to navigate to a parent folder, you can use "../".
For example: read.csv("../olddata/DATA/mydata.csv") which is the ...
What are the nuances of scope prototypal / prototypical inheritance in AngularJS?
...e parentScope object properties with the same names.
Takeaways:
If we read childScope.propertyX, and childScope has propertyX, then the prototype chain is not consulted.
If we set childScope.propertyX, the prototype chain is not consulted.
One last scenario:
delete childScope.anArray
childSc...