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What does curly brackets in the `var { … } = …` statements do?
..., 2, 3)
The first code chunk is shorthand for:
var {Hotkey: Hotkey} = require("sdk/hotkeys");
// Or
var Hotkey = require("sdk/hotkeys").Hotkey;
You can rewrite the second code chunk as:
let Cc = Components.classes;
let Ci = Components.interfaces;
let Cr = Components.results;
let Cu = Component...
How do you import a large MS SQL .sql file?
I use RedGate SQL data compare and generated a .sql file, so I could run it on my local machine. But the problem is that the file is over 300mb, which means I can't do copy and paste because the clipboard won't be able to handle it, and when I try to open the file in SQL Server Management Studio I g...
The “unexpected ++” error in jslint [duplicate]
...s such as C, they made it possible to write one-liners that: for (p = src, q = dest; !*p; p++, q++) *q = *p; Most of the buffer overrun bugs that created terrible security vulnerabilities were due to code like this. In my own practice, I observed that when I used ++ and --, my code tended to be too ...
How do I kill all the processes in Mysql “show processlist”?
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You need to kill them one by one, MySQL does not have any massive kill command. You can script it in any language, for example in PHP you can use something like:
$result = mysql_query("SHOW FULL PROCESSLIST");
while ($row=mysql_fetch_array($result)) {
$proces...
Get last n lines of a file, similar to tail
...
This may be quicker than yours. Makes no assumptions about line length. Backs through the file one block at a time till it's found the right number of '\n' characters.
def tail( f, lines=20 ):
total_lines_wanted = lines
BLOCK...
How to see which flags -march=native will activate?
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You can use the -Q --help=target options:
gcc -march=native -Q --help=target ...
The -v option may also be of use.
You can see the documentation on the --help option here.
...
Why can't non-default arguments follow default arguments?
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All required parameters must be placed before any default arguments. Simply because they are mandatory, whereas default arguments are not. Syntactically, it would be impossible for the interpreter to decide which values match which...
WebSockets protocol vs HTTP
...transfer. However, this doesn't help with client to server latency which requires a new connection to be established for each client to server message.
Your 48 byte HTTP handshake is not realistic for real-world HTTP browser connections where there is often several kilobytes of data sent as part of...
Determine which element the mouse pointer is on top of in JavaScript
...useIsOver = document.elementFromPoint(x, y);
document.elementFromPoint
jQuery event object
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Python argparse mutual exclusive group
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This does not answer the question because it does not allow you to make "noname" commands and achieve what OP asked for [-a xxx | [-b yyy -c zzz]]
– The Godfather
May 15 '19 at 11:37
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