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Stop/Close webcam which is opened by navigator.getUserMedia
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FF, Chrome and Opera has started exposing getUserMedia via navigator.mediaDevices as standard now (Might change :)
online demo
navigator.mediaDevices.getUserMedia({audio:true,video:true})
.then(stream => {
window.localStream = strea...
How to create the perfect OOP application [closed]
...
So, how to approach these sorts of problems in the future?
I would have started by highlighting every important noun in the problem description:
Basic sales tax is applicable at a rate of 10% on all goods, except books, food, and medical products that are exempt. Import duty is an additional ...
How to generate random number with the specific length in python
...igits:
from random import randint
def random_with_N_digits(n):
range_start = 10**(n-1)
range_end = (10**n)-1
return randint(range_start, range_end)
print random_with_N_digits(2)
print random_with_N_digits(3)
print random_with_N_digits(4)
Output:
33
124
5127
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Is it correct to use JavaScript Array.sort() method for shuffling?
...orithm which effectively partitions the collection into "shuffled" (at the start of the collection, initially empty) and "unshuffled" (the rest of the collection). At each step of the algorithm, pick a random unshuffled element (which could be the first one) and swap it with the first unshuffled ele...
When to use ' (or quote) in Lisp?
...ring and returning a list of the resulting ... things. Let's make a false start:
(defun mess-with (number string)
'(value-of-number (1+ number) something-with-string (length string)))
Lisp> (mess-with 20 "foo")
(VALUE-OF-NUMBER (1+ NUMBER) SOMETHING-WITH-STRING (LENGTH STRING))
Hey! That's...
How to prevent auto-closing of console after the execution of batch file
... command prompt windows and the new windows will not exit automatically.
start "title" call abcd.exe param1 param2
start "title" call xyz.exe param1 param2
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How to tell if node.js is installed or not
..."open a terminal window" means do 1 of 2 things in Windows. Either use the Start button, go to Accessories, click Command Prompt; or in the Start button, go to All Programs, then the Node directory, then Node.js Command Prompt. Node has changed and a lot of blogs are way out of date, or just plain ...
How to remove non-alphanumeric characters?
... ]/i', '', $str);
The i stands for case insensitive.
^ means, does not start with.
\d matches any digit.
a-z matches all characters between a and z. Because of the i parameter you don't have to specify a-z and A-Z.
After \d there is a space, so spaces are allowed in this regex.
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Get Substring - everything before certain char
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Things have moved on a bit since this thread started.
Now, you could use
string.Concat(s.TakeWhile((c) => c != '-'));
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Delete all rows in an HTML table
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Points to note, on the Watch out for common mistakes:
If your start index is 0 (or some index from begin), then, the correct code is:
var tableHeaderRowCount = 1;
var table = document.getElementById('WRITE_YOUR_HTML_TABLE_NAME_HERE');
var rowCount = table.rows.length;
for (var i = tabl...