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Filter Java Stream to 1 and only 1 element
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Create a custom Collector
public static <T> Collector<T, ?, T> toSingleton() {
return Collectors.collectingAndThen(
Collectors.toList(),
list -> {
if (list.size() != 1) {
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Is BCrypt a good hashing algorithm to use in C#? Where can I find it? [closed]
I have read that when hashing a password, many programmers recommend using the BCrypt algorithm.
2 Answers
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How to run Node.js as a background process and never die?
...nded processes. And you can kill a backgrounded process by running kill %1 or kill %2 with the number being the index of the process.
Powerful solution (allows you to reconnect to the process if it is interactive):
screen
You can then detach by pressing Ctrl+a+d and then attach back by running ...
Case insensitive 'in'
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username = 'MICHAEL89'
if username.upper() in (name.upper() for name in USERNAMES):
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Alternatively:
if username.upper() in map(str.upper, USERNAMES):
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Or, yes, you can make a custom method.
s...
What is the difference between i++ and ++i?
...used in numerous pieces of C# code, and I'd like to know when to use i++ or ++i ( i being a number variable like int , float , double , etc). Anyone who knows this?
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warning this call is not awaited, execution of the current method continues
...nc Task<string> GetNameAsync()
{
string firstname = await PromptForStringAsync("Enter your first name: ");
string lastname = await PromptForStringAsync("Enter your last name: ");
return firstname + lastname;
}
And use it as follows:
public static void DoStuff()
{
Task<str...
\r\n, \r and \n what is the difference between them? [duplicate]
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\r = CR (Carriage Return) → Used as a new line character in Mac OS before X
\n = LF (Line Feed) → Used as a new line character in Unix/Mac OS X
\r\n = CR + LF → Used as a new line character in Windows
share
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What is the difference between return and return()?
...allowed because they are allowed in any expression to influence evaluation order, but in your examples they're just superfluous.
return is not a function, but a statement. It is syntactically similar to other simple control flow statements like break and continue that don't use parentheses either.
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Comparing numbers in Bash
I'm starting to learn about writing scripts for the bash terminal, but I can't work out how to get the comparisons to work properly. The script I'm using is:
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Why use a public method in an internal class?
...PDATE: This question was the subject of my blog in September 2014. Thanks for the great question!
There is considerable debate on this question even within the compiler team itself.
First off, it's wise to understand the rules. A public member of a class or struct is a member that is accessible to...