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Most efficient way to concatenate strings?
...o" + var1 + "bar" + var2 + "hello" + var3 + "world", the compiler automatically turns that into a string.concat call, which is as efficient as it gets. This answer is incorrect, there are plenty of better answers to choose from
– csauve
Jan 12 '11 at 17:56
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Booleans, conditional operators and autoboxing
...a.lang.Exception;
descriptor: ([Ljava/lang/String;)V
flags: ACC_PUBLIC, ACC_STATIC
Code:
stack=2, locals=2, args_size=1
0: invokestatic #2 // Method returnsNull:()Ljava/lang/Boolean;
3: invokevirtual #3 // Method java...
Single Page Application: advantages and disadvantages [closed]
...pages.
The number of pages user downloads during visit to my web site?? really how many mails some reads when he/she opens his/her mail account. I read >50 at one go. now the structure of the mails is almost the same. if you will use a server side rendering scheme the server would then render it...
Why is auto_ptr being deprecated?
...cs and the magic of rvalue references, it can do so considerably more naturally. It also "fits" with the rest of the standard library considerably better (though, in fairness, some of that is thanks to the rest of the library changing to accommodate move semantics instead of always requiring copying...
Differences between Agda and Idris
...gt; a -> b -> Type where
refl : x = x
while in Agda, it is
data _≡_ {l} {A : Set l} (x : A) : A → Set a where
refl : x ≡ x
The l in the Agda defintion can be ignored, as it has to do with the universe polymorphism that Edwin mentions in his answer.
The important difference is...
How to prepend a string to a column value in MySQL?
I need a SQL update statement for updating a particular field of all the rows with a string "test" to be added in the front of the existing value.
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How do RVM and rbenv actually work?
I am interested in how RVM and rbenv actually work.
5 Answers
5
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Diff output from two programs without temporary files
... use >(command) if you want to pipe something into a command.
This is called "Process Substitution" in Bash's man page.
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Google Authenticator implementation in Python
...m/tadeck/onetimepass).
import hmac, base64, struct, hashlib, time
def get_hotp_token(secret, intervals_no):
key = base64.b32decode(secret, True)
msg = struct.pack(">Q", intervals_no)
h = hmac.new(key, msg, hashlib.sha1).digest()
o = ord(h[19]) & 15
h = (struct.unpack("&g...
Getting the count of unique values in a column in bash
... count the frequency of occurrence of the different values in a column for all the files in a folder and sort them in decreasing order of count (highest count first). How would I accomplish this in a Linux command line environment?
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