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How to define @Value as optional
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answered Jul 8 '16 at 16:05
Andy BrownAndy Brown
7,73022 gold badges2828 silver badges4242 bronze badges
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How can Perl's print add a newline by default?
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Perl 6 has the say function that automatically appends \n.
You can also use say in Perl 5.10 or 5.12 if you add
use feature qw(say);
to the beginning of your program. Or you can use Modern::Perl to get this and other features.
See perldoc feature for more detai...
When to use lambda, when to use Proc.new?
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As of Ruby 2.5, break from Procs raises LocalJumpError, whereas break from lambdas behaves just like return (i.e., return nil).
– Masa Sakano
Oct 16 '18 at 20:35
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What is the difference between ndarray and array in numpy?
.... x = np.array([1,2.1,3]) if isinstance(x,np.array): # will give you a TypeError
– Steve L
Jul 11 '17 at 14:53
5
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How to retrieve GET parameters from javascript? [duplicate]
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Thank you for noticing my error. I also took the liberty of modifying your code, removing the second split invocation, which can be replaced with a local variable.
– Bakudan
Jul 2 '14 at 15:49
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What are invalid characters in XML
...s are invalid also. If you try to write 0x03 to an Xml document you get an error typically and if you do manage to properly escape it into an XML document, most viewers will complain about the invalid character. Edge case but it does happen.
– Rick Strahl
Jan 2...
Equivalent of “throw” in R
How does one "throw" an error in R? I have a function that takes a data frame and some column names and does stuff with them. If the columns don't exist, I want the function to stop and to stop all functions depending on it.
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Relative paths based on file location instead of current working directory [duplicate]
... [[ -L $target || -e $target ]] || { command printf '%s\n' "$FUNCNAME: ERROR: '$target' does not exist." >&2; return 1; }
command cd "$(command dirname -- "$target")" # Change to target dir; necessary for correct resolution of target path.
fname=$(command basename -- "$target"...
Python: Why is functools.partial necessary?
...ocking. :-) I'm not sure I'd go as far as Prof. Bauer and call it a design error, but it is hard for human programmers to completely switch between one way of thinking and another. (Or perhaps this is just my insufficient Python experience.)
– ShreevatsaR
Jul 1...
How can I start PostgreSQL server on Mac OS X?
...t is the result of pg_ctl -D /usr/local/var/postgres status?
Are there any error messages in the server.log?
Make sure tcp localhost connections are enabled in pg_hba.conf:
# IPv4 local connections:
host all all 127.0.0.1/32 trust
Check the listen_addresses and port in postgresql.conf:
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