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How do I check that a Java String is not all whitespaces?
...s behavior isn't correctly documented and appears to diverge substantially from every other implementation of string matching using Regular Expressions.
– Rob Raisch
May 26 '15 at 15:46
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org.xml.sax.SAXParseException: Content is not allowed in prolog
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Absolutely agree @Gewure :) That was some ancient post from 2012 and I even forget about it, but true
– Egor
Sep 10 '17 at 20:26
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How to add an empty column to a dataframe?
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if you want to add column name from a list
df=pd.DataFrame()
a=['col1','col2','col3','col4']
for i in a:
df[i]=np.nan
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Vim: Delete buffer without losing the split window
...# ("buffer delete" "alternate file") deletes the buffer we just moved away from. See: help bp, help bd, help alternate-file.
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Add a custom attribute to a Laravel / Eloquent model on load?
...erstand how your stuff works. If EventSession::all() returns a JSON object from an API, you are not really using a Laravel model, right? Sorry, I'm confused on how you implemented you model.
– Alexandre Danault
Jun 21 '13 at 13:40
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Placement of the asterisk in pointer declarations
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Unfortunately from my adventures in to the wild I see plenty of both styles. In my team we now use clang-format with a style we've agreed on. This at least means all of the code our team produces has the same style for where the whitespace...
Do Java arrays have a maximum size?
...AY_SIZE be applied only when you are using an ArrayList? That is different from using an array like int[] array = new int[some_value_here]; isn't it? Why can a constant defined in ArrayList be applied to a normal array (defined with [])? Are they the same behind the scenes?
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What's the difference between a method and a function?
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Coming from a functional programming background, I feel there is a profound distinction between function and method. Mainly methods have side effects, and that functions should be pure thus giving a rather nice property of referent...
Using MemoryStore in production
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From your link: "It's highly not recommend to use it in production!". The question is about "Using MemoryStore in production".
– Damien
May 20 at 19:24
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grep using a character vector with multiple patterns
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Good answers, however don't forget about filter() from dplyr:
patterns <- c("A1", "A9", "A6")
>your_df
FirstName Letter
1 Alex A1
2 Alex A6
3 Alex A7
4 Bob A1
5 Chris A9
6 Chris A6
result <- filter(your_df, gr...