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What does ~~ (“double tilde”) do in Javascript?
... integers. This works whether the operands are (floating-point) numbers or strings, and the result is a number.
In other words, it yields:
function(x) {
if(x < 0) return Math.ceil(x);
else return Math.floor(x);
}
only if x is between -(231) and 231 - 1. Otherwise, overflow will occur and ...
What does collation mean?
...
Rules that tell how to compare and sort strings: letters order; whether case matters, whether diacritics matter etc.
For instance, if you want all letters to be different (say, if you store filenames in UNIX), you use UTF8_BIN collation:
SELECT 'A' COLLATE UTF8_...
Can I exclude some concrete urls from inside ?
... or to add a check in the doFilter() method of the Filter listening on /*.
String path = ((HttpServletRequest) request).getRequestURI();
if (path.startsWith("/specialpath/")) {
chain.doFilter(request, response); // Just continue chain.
} else {
// Do your business stuff here for all paths ot...
How add context menu item to Windows Explorer for folders [closed]
...cted file to your custom program
More customization:
Add icon: add a string value named icon for key created at step 1 with value matching an icon resource path. You can also provide an integer arguments to specify which icon to use. Example: %SystemRoot%\System32\shell32.dll,3
Display only on...
Use PHP to create, edit and delete crontab jobs?
... I used exec('crontab -l', $output). Then implode the $output array into a string (with \n as the glue).
– David Fairbanks
Dec 23 '12 at 1:35
1
...
Can “using” with more than one resource cause a resource leak?
... for your code:
.method private hidebysig static
void Main (
string[] args
) cil managed
{
// Method begins at RVA 0x2050
// Code size 74 (0x4a)
.maxstack 2
.entrypoint
.locals init (
[0] class [System.Drawing]System.Drawing.Font font3,
[1] clas...
Best practices for reducing Garbage Collector activity in Javascript
...an object via new or via literal syntax [...], or {}.
When you concatenate strings.
When you enter a scope that contains function declarations.
When you perform an action that triggers an exception.
When you evaluate a function expression: (function (...) { ... }).
When you perform an operation that...
How to sort a Ruby Hash by number value?
... am running into is that the default Hash.sort function sorts numbers like strings rather than by number size.
4 Answers
...
Changing every value in a hash in Ruby
...
If you want the actual strings themselves to mutate in place (possibly and desirably affecting other references to the same string objects):
# Two ways to achieve the same result (any Ruby version)
my_hash.each{ |_,str| str.gsub! /^|$/, '%' }
my_h...
MySQL combine two columns into one column
... The SQL standard provides the CONCAT() function to concatenate two strings into a single string. SQLite, however, does not support the CONCAT() function. Instead, it uses the concatenate operator (||) to join two strings into one.
– PaulH
Oct 28 '19 at ...