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Uses for Optional
...ld be a legal representation of a state (see Map.get) or an implementation error like a missing or failed initialization.
This changes dramatically with the persistent use of Optional. Here, already the occurrence of null signifies the presence of a bug. (Because if the value were allowed to be mis...
How to remove/ignore :hover css style on touch devices
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I've used try/catch just in case some odd error shows up, that could crash the script, like deleteRule not working because of same-origin policy or flaky support on IE (edited the comment to reflect that). But yeah, in most cases, just a simple check should be suffic...
How to check whether a pandas DataFrame is empty?
... @Quant - The documentation has a discussion on why bool raises an error for a dataframe here: link. Quote: "Should it be True because it’s not zero-length? False because there are False values? It is unclear, so instead, pandas raises a ValueError"
– Bij
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How to create a unique index on a NULL column?
... index like that, make sure that ANSI_NULLS is ON, otherwise you'll get an error when trying to insert data.
– Arne
Oct 1 '12 at 7:35
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E731 do not assign a lambda expression, use a def
...ile. One might say "f" whereas the other says "lambda". Maybe the lambda error is easier to scan because it's not a single-character function name, or a poorly-named long name?
– g33kz0r
Feb 17 '15 at 19:08
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What is Autoloading; How do you use spl_autoload, __autoload and spl_autoload_register?
...nless I have a class which extends another class (parent). PHP then throws error that it cannot find that parent class, even they're all in the same directory/namespace! What is confusing is that literally only first level classes are found, so I had to put another spl_autoload_register() with anony...
source of historical stock data [closed]
... Dividend/Share
d1 Last Trade Date
d2 Trade Date
e Earnings/Share
e1 Error Indication (returned for symbol changed / invalid)
e7 EPS Estimate Current Year
e8 EPS Estimate Next Year
e9 EPS Estimate Next Quarter
f6 Float Shares
g Day's Low
h Day's High
j 52-week Low
k 52-week High
g1...
Is there a way to cache GitHub credentials for pushing commits?
...trc does not work outside of a git repository. It fails with the following error:
fatal: Not a git repository: . at /usr/share/perl5/Git.pm line 214.
There is no real reason why need to be within a repository, though. Credential helpers should be able to work just fine outside the repository ...
Same-named attributes in attrs.xml for custom view
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When I follow this answer I get ERROR: In <declare-styleable> com_app_view_widget, unable to find attribute customAttr For all the view I try to declare for. Any ideas?
– Dapp
Jun 9 '14 at 14:54
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How can I export tables to Excel from a webpage [closed]
...urity measures. Excel file must be a TRUE Excel document or it will throw error when opening.
– Phil
Aug 9 '16 at 14:07
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