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Difference between single and double square brackets in Bash
...dition tests.
Double [[]] are an extension to the standard [] and are supported by bash and other shells (e.g. zsh, ksh). They support extra operations (as well as the standard posix operations). For example: || instead of -o and regex matching with =~. A fuller list of differences can be found in ...
Useful GCC flags for C
...d=XXX , what other really useful, but less known compiler flags are there for use in C?
24 Answers
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Fully backup a git repo?
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Whats about just make a clone of it?
git clone --mirror other/repo.git
Every repository is a backup of its remote.
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How is this fibonacci-function memoized?
...n a value is needed, it is calculated, and kept ready in case it is asked for again. If we define some list, xs=[0..] and later ask for its 100th element, xs!!99, the 100th slot in the list gets "fleshed out", holding the number 99 now, ready for next access.
That is what that trick, "going-throug...
Is there an equivalent for the Zip function in Clojure Core or Contrib?
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(map vector '(1 2 3) '(4 5 6))
does what you want:
=> ([1 4] [2 5] [3 6])
Haskell needs a collection of zipWith (zipWith3, zipWith4, ...) functions, because they all need to be of a specific type; in particular, the number of ...
How do I check for null values in JavaScript?
How can I check for null values in JavaScript? I wrote the code below but it didn't work.
19 Answers
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When to use PNG or JPG in iPhone development?
...CPU energy to display. However, large PNGs may take longer to read from storage than more compressed image formats, and thus be slower to display.
JPG's are smaller to store, but lossy (amount depends on compression level), and to display them requires a much more complicated decoding algorithm. ...
Why use pointers? [closed]
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Why use pointers over normal variables?
Short answer is: Don't. ;-) Pointers are to be used where you can't use anything else. It is either because the lack of appropriate functionality, missing data types or for pure perfomance. More below...
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PHP - how to best determine if the current invocation is from CLI or web server?
...rmine whether the current invocation of PHP is from the command line (CLI) or from the web server (in my case, Apache with mod_php).
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What is the maximum number of characters that nvarchar(MAX) will hold?
...cters that will fit into a NVARCHAR(MAX) field.
Using the other answer's more detailed numbers, you should be able to store
(2 ^ 31 - 1 - 2) / 2 = 1'073'741'822 double-byte characters
1 billion, 73 million, 741 thousand and 822 characters to be precise
in your NVARCHAR(MAX) column (unfortunatel...