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Using comparison operators in Scala's pattern matching system
... drop[A](l: List[A], n: Int): List[A] = l match {
case Nil => sys.error("drop on empty list")
case xs if n <= 0 => xs
case _ :: xs => drop(xs, n-1)
}
link to scala fiddle : https://scalafiddle.io/sf/G37THif/2
as you can see the case xs if n <= 0 => xs statem...
How can I sort generic list DESC and ASC?
...or many types. And for compiled set of types you can have numeric overflow error as mentioned in comment before
– Vadim Levkovsky
Aug 11 '17 at 9:36
add a comment
...
Array.Add vs +=
...ting array. An array is a collection of fixed size, so you will receive an error because it can't be extended.
$array += $element creates a new array with the same elements as old one + the new item, and this new larger array replaces the old one in the $array-variable
You can use the += opera...
How to use LINQ to select object with minimum or maximum property value
... the class of the instances does not implement IComparable, then a runtime error will be thrown:
At least one object must implement IComparable
Luckily, this can still be fixed rather cleanly. The idea is to associate a distanct "ID" with each entry that serves as the unambiguous tie-breaker. We c...
LINQ To Entities does not recognize the method Last. Really?
...d solve the problem. This solves a problem of links not working due to 404 errors in the future.
– Studocwho
Jun 17 '19 at 21:45
1
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Ant: How to execute a command for each file in directory?
...local name="hasMoreElements" />
<!-- unless to not get a error on empty lists -->
<loadresource property="element" unless:blank="@{list}" >
<concat>@{list}</concat>
<filterchain>
<replacer...
How to create full compressed tar file using Python?
...ition to @Aleksandr Tukallo's answer, you could also obtain the output and error message (if occurs). Compressing a folder using tar is explained pretty well on the following answer.
import traceback
import subprocess
try:
cmd = ['tar', 'czfj', output_filename, file_to_archive]
output = su...
How to get first record in each group using Linq
...
So glad i found this. I got error message "The method 'First' can only be used as a final query operation. Consider using the method 'FirstOrDefault' in this instance instead." from your example. Only operation on the list i did after the query was pass...
Switch case with fallthrough?
...
I get a syntax error if I omit ;; I need to use ;;& if I want to continue testing.
– Jasen
Oct 27 '16 at 20:53
...
Is storing a delimited list in a database column really that bad?
...f if there is a ui that handles uniqueness and data types (otherwise would error or misbehave), ui drops and creates it anyway, there is a driver table where the values come from to make them unique, field like '%P%' can be used, values being P, R, S, T, counting doesn't matter, and sorting doesn't ...