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Java: What is the difference between and ?
...intln("In Static");
}
{
System.out.println("In Instance");
}
To test, use
Class<ByteCodeParent> bcp2 =(Class<ByteCodeParent>) Class.forName("ByteCodeParent");
ByteCodeParent bcp4= bcp2.newInstance();
...
How to click first link in list of items after upgrading to Capybara 2.0?
...gests:
https://thoughtbot.com/blog/write-reliable-asynchronous-integration-tests-with-capybara#find-the-first-matching-element
Bad:
first(".active").click
If there isn’t an .active element on the page yet, first will return nil and the click will fail.
Good:
If you want to make sure there's ex...
Difference between `mod` and `rem` in Haskell
... Also from stackoverflow.com/a/6964760/205521 it seems like rem is fastest.
– Thomas Ahle
Sep 28 '14 at 10:53
17
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Check if any ancestor has a class using jQuery
...
I might venture to say (without testing this) that this method is better. Elem.parents will traverse the entire parent dom strucutre, where closest() should (probably) stop once it finds the nearest parent with that element and is therefore more efficient. ...
Pandas aggregate count distinct
... already given, the solution using the string "nunique" seems much faster, tested here on ~21M rows dataframe, then grouped to ~2M
%time _=g.agg({"id": lambda x: x.nunique()})
CPU times: user 3min 3s, sys: 2.94 s, total: 3min 6s
Wall time: 3min 20s
%time _=g.agg({"id": pd.Series.nunique})
CPU tim...
To find whether a column exists in data frame or not
...
You could also use if(!is.null(abcframe$d)) to test whether d exists in abcframe.
dat <- data.frame(a = 1:2, b = 2:3, c = 4:5)
if (!is.null(dat$d)) {
print("d exists")
} else {
print("d does not exist")
}
if (!is.null(dat$a)) {
print("a exists")
} else {
prin...
How can I add an ampersand for a value in a ASP.net/C# app config file value
...at DLeh is talking about exactly, but unescape definitely works fine. Just tested this with standard appSettings as well as a custom NameValueCollection section: ampersand is unescaped properly on both.
– julealgon
Nov 4 '19 at 22:25
...
Resharper- Find all unused classes
...ally be sure unless every time you remove the unused class you run all the tests inside your application [every possible layer] to be 80% sure you are safe. Moral of the story : a class might sound unused to Resharper but it might be resurrected when you use Dependency Injection.
...
Find an element in DOM based on an attribute value
...e want to select the p element without using id or every p on the DOM (and test attributes)
– Arthur
Apr 13 '17 at 14:29
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Responsive website zoomed out to full width on mobile
I am testing out Bootstrap responsiveness navbar and I have a demo website. When I resize the browser on a desktop, it all works fine including the nav bar which become collapsible menu with a small icon on the top which I can click to see more menu buttons.
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