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What does the explicit keyword mean?
...cidental construction that can hide bugs.
Contrived example:
You have a MyString(int size) class with a constructor that constructs a string of the given size. You have a function print(const MyString&), and you call print(3) (when you actually intended to call print("3")). You expect it to p...
How to calculate time elapsed in bash script?
...ers of detail, from bash-hackers.org:
%(FORMAT)T outputs the date-time string resulting from using FORMAT
as a format string for strftime(3). The associated argument is the
number of seconds since Epoch, or -1 (current time) or -2 (shell
startup time). If no corresponding argument is suppl...
Verifying that a string contains only letters in C#
I have an input string and I want to verify that it contains:
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Why does “split” on an empty string return a non-empty array?
Split on an empty string returns an array of size 1 :
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How to capitalize the first letter of a String in Java?
I am using Java to get a String input from the user. I am trying to make the first letter of this input capitalized.
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How can I hash a password in Java?
...der enc = Base64.getEncoder();
System.out.printf("salt: %s%n", enc.encodeToString(salt));
System.out.printf("hash: %s%n", enc.encodeToString(hash));
Here's a utility class that you can use for PBKDF2 password authentication:
import java.security.NoSuchAlgorithmException;
import java.security.Secu...
How can I print variable and string on same line in Python?
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Use , to separate strings and variables while printing:
print "If there was a birth every 7 seconds, there would be: ",births,"births"
, in print statement separates the items by a single space:
>>> print "foo","bar","spam"
foo bar s...
How to escape JSON string?
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I use System.Web.HttpUtility.JavaScriptStringEncode
string quoted = HttpUtility.JavaScriptStringEncode(input);
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List of strings to one string
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I would go with option A:
String.Join(String.Empty, los.ToArray());
My reasoning is because the Join method was written for that purpose. In fact if you look at Reflector, you'll see that unsafe code was used to really optimize it. The other two als...
Convert hex string to int in Python
How do I convert a hex string to an int in Python?
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