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querySelector and querySelectorAll vs getElementsByClassName and getElementById in JavaScript
...ttps://jsperf.com/getelementsbyclassname-vs-queryselectorall/18
It runs a test on the 2 x examples above, plus it chucks in a test for jQuery's equivalent selector as well. my test results were as follows:
getElementsByClassName = 1,138,018 operations / sec - <<< clear winner
querySelecto...
Why does C# not provide the C++ style 'friend' keyword? [closed]
...rest of the application. I use the "friend" assembly tricks to create unit test assemblies for these objects.
– Quibblesome
Oct 23 '09 at 13:11
26
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Python list iterator behavior and next(iterator)
...:
print(i)
next(a)
>>>
0
2
4
6
8
Works like expected.
Tested in Python 2.7 and in Python 3+ . Works properly in both
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Mongoose.js: Find user by username LIKE value
... and checking for [^a-zA-Z0-9] then not proceeding. In this case, its just test input so makes sense.
– Jason Sebring
Jan 13 '14 at 0:43
...
How to organize large R programs?
...nterface
a lot of sanity checks via R CMD check
a chance to add regression tests
as well as a means for namespaces.
Just running source() over code works for really short snippets. Everything else should be in a package -- even if you do not plan to publish it as you can write internal packages fo...
Where to define custom error types in Ruby and/or Rails?
...w I'm handling custom errors in Rails, including attaching error messages, testing, and how to handle this with ActiveRecord models.
Creating Custom Error
class MyClass
# create a custome error
class MissingRequirement < StandardError; end
def my_instance_method
raise MyClass::Miss...
How to get first character of string?
... chartAt(0) in Firefox as of Firefox 71. See for yourself here: jsperf.com/testing-the-first-character-in-a-string/1
– Stephen M Irving
Dec 16 '19 at 21:54
1
...
Insert string at specified position
...text to the next line after it found the keyword.
$oldstring = "This is a test\n#FINDME#\nOther text and data.";
function insert ($string, $keyword, $body) {
return substr_replace($string, PHP_EOL . $body, strpos($string, $keyword) + strlen($keyword), 0);
}
echo insert($oldstring, "#FINDME#", ...
Adding a background image to a element
...
Use like ..
<div style="background-image: url(../images/test-background.gif); height: 200px; width: 400px; border: 1px solid black;">Example of a DIV element with a background image:</div>
<div style="background-image: url(../images/test-background.gif); height: 200px;...
raw_input function in Python
...and run the program.
This is what it looked like for me:
C:\temp>type test.py
print "Halt!"
s = raw_input("Who Goes there? ")
print "You may pass,", s
C:\temp>python test.py
Halt!
Who Goes there? Magnus
You may pass, Magnus
I types my name and pressed [Enter] after the program
had printed...