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In Ruby, is there an Array method that combines 'select' and 'map'?
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You can use reduce for this, which requires only one pass:
[1,1,1,2,3,4].reduce([]) { |a, n| a.push(n*3) if n==1; a }
=> [3, 3, 3]
In other words, initialize the state to be what you want (in our case, an empty list to fill: []), then always make sure to return this ...
Move assignment operator and `if (this != &rhs)`
..., other.mArray + mSize, mArray);
}
return *this;
}
Explanation:
One of the more expensive things you can do on modern hardware is make a trip to the heap. Anything you can do to avoid a trip to the heap is time & effort well spent. Clients of dumb_array may well want to often assign...
How do I keep two side-by-side divs the same height?
... by side. I'd like the height of them to be the same, and stay the same if one of them resizes. I can't figure this one out though. Ideas?
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deciding among subprocess, multiprocessing, and thread in Python?
...hreads are notoriously subtle, and, with CPython, you are often limited to one core, with them (even though, as noted in one of the comments, the Global Interpreter Lock (GIL) can be released in C code called from Python code).
I believe that most of the functions of the three modules you cite can ...
Cookies on localhost with explicit domain
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Not sure why everyone is +1'ing this, I set the domain of the cookie to null or false or empty string and it still doesn't save if on localhost.
– Justin
Sep 6 '11 at 14:34
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How to get past the login page with Wget?
...Based on the manual page:
# Log in to the server. This only needs to be done once.
wget --save-cookies cookies.txt \
--keep-session-cookies \
--post-data 'user=foo&password=bar' \
--delete-after \
http://server.com/auth.php
# Now grab the page or pages we care about.
wget ...
Apply formula to the entire column
... Make sure you CLEAR your column data first and only apply your formula to one. The above answer with "ArrayFormula" seems to be able to apply a many cells to one formula, which is not what OP wanted.
– Thanasis Kapelonis
May 3 '16 at 18:03
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Equals(=) vs. LIKE
...nded to the length of the longer
string by concatenation on the right of one or more pad
characters, where the pad character is chosen based on CS. If
CS has the NO PAD attribute, then the pad character is an
implementation-dependent character different from any
character in the characte...
What are the undocumented features and limitations of the Windows FINDSTR command?
...ys relative to the provided path, or relative to the current directory if none provided.
Note - The filename prefix can be avoided when searching multiple files by using the non-standard (and poorly documented) wildcards < and >. The exact rules for how these wildcards work can be found here. ...
C/C++ include header file order
...should include files be specified, i.e. what are the reasons for including one header before another?
10 Answers
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