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Using Linq to get the last N elements of a collection?
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You can solve this problem by explicitly casting mystring to IEnumerable<String>: ((IEnumerable<String>)mystring).Reverse().Take(2).Reverse()
– Jan Hettich
Aug 17 '11 at 18:08
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Differences between fork and exec
...he "exec" functions to create the child process
execvp (argv[0], const_cast<char**>(argv));
} else { // This is the Parent Process
//Continue executing parent process
}
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iOS: Use a boolean in NSUserDefaults
...MainScreen()
}
alternatively we can use object(forKey:) then cast it to bool
if let exists = Defaults.object(forKey: "isLoggedIn"), let isLoggedIn = exists.boolValue where isLoggedIn == true {
displayMainScreen()
} else {
displayLoginScreen()
}
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String concatenation vs. string substitution in Python
...ou are profiling how. For one your concat is slow because you have two str casts in it. With strings the result is the opposite, since string concat is actually faster than all the alternatives when only three strings are concerned.
– Justus Wingert
Sep 16 '15 ...
Row count with PDO
... count($nRows); - count() is an array function :P. I'd also recommend type casting the result from fetchColumn() to an integer. $count = (int) $stmt->fetchColumn()
– Cobby
May 26 '11 at 23:59
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How do I convert an array object to a string in PowerShell?
...r $ofs)
# This Is a cat
"$a"
# This-Is-a-cat
$ofs = '-' # after this all casts work this way until $ofs changes!
"$a"
Using operator join
# This-Is-a-cat
$a -join '-'
# ThisIsacat
-join $a
Using conversion to [string]
# This Is a cat
[string]$a
# This-Is-a-cat
$ofs = '-'
[string]$a
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Filtering a list of strings based on contents
...abc']
In Python 3, it returns an iterator instead of a list, but you can cast it:
>>> list(filter(lambda k: 'ab' in k, lst))
['ab', 'abc']
Though it's better practice to use a comprehension.
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Show or hide element in React
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!!someValue && <SomeElement /> // will render nothing as we cast the value to boolean
Reasons for using this approach instead of CSS 'display: none';
While it might be 'cheaper' to hide an element with CSS - in such case 'hidden' element is still 'alive' in react world (which migh...
Why can't an anonymous method be assigned to var?
...>
{
return dynObj.arg0.ToUpper() + (dynObj.arg1 * 45); //screw type casting, amirite?
};
Console.WriteLine(y(myParams));
Tip: You can use Action<dynamic> if you don't need to return an object.
Yeah I know it probably goes against your programming principles, but this makes sense to m...
SQL to determine minimum sequential days of access?
...I just didn't worry about it doing it here. It wouldn't be any faster than casting it to an int, but does have the flexibility to count hours, months, whatever.
– Rob Farley
Jul 24 '09 at 23:13
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