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Select random lines from a file
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If you just need a random set of lines, not in a random order, then shuf is very inefficient (for big file): better is to do reservoir sampling, as in this answer.
– petrelharp
Sep 6 '15 at 23:24
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Map enum in JPA with fixed values?
... be unique, whereas any other values or fields are not. It's true that the order could change (don't use ordinal) and the name could be changed as well (don't change enum names :P), but so could any other value... I'm not sure that I see the great value with adding the ability to store a different v...
How to retrieve an element from a set without removing it?
... since iteration seems to sort the elements. I would prefer them in random order...
– Daren Thomas
Sep 12 '08 at 20:17
10
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What is a proper naming convention for MySQL FKs?
...rom KEY_COLUMN_USAGE where REFERENCED_TABLE_SCHEMA = 'your_db_schema_name' ORDER BY TABLE_NAME;
For example you might receive the following from the query:
+------------+-------------+-----------------+-----------------------+------------------------+
| TABLE_NAME | COLUMN_NAME | CONSTRAINT_NAME ...
Checking for an empty field with MySQL
...er late to this discussion, but the statement will work if you reverse the order: "AND ((email IS NOT NULL) AND (email != '')). If evaluated in the other order, the statement evaluates as null (not TRUE) if the email address is NULL, and thus will not be either TRUE or FALSE. So the IS NULL check...
How to open, read, and write from serial port in C?
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What is the difference between C# and .NET?
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.NET CLR is all about types. In order to support multiple languages, they came up with CTS - Common type system which defines how types must be defined and rules governing them e.g. inheritance, object lifetime etc. C++/CLI, C#, VB are all languages conform...
How to call Stored Procedure in Entity Framework 6 (Code-First)?
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This syntax requires no modification to the order of the SProc's Parameters, in other words Ordinal Positioning.
– GoldBishop
Oct 16 '15 at 12:52
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Accessing class variables from a list comprehension in the class definition
...[i for i in range(1) for j in range(x)]
This design decision was made in order to throw an error at genexp creation time instead of iteration time when creating the outermost iterable of a generator expression throws an error, or when the outermost iterable turns out not to be iterable. Comprehens...
Flatten an Array of Arrays in Swift
...s:
array.compactMap({$0})
//Output
[1, 2, [[3, 4], [5, 6, [7]]], 8]
In order to solve this problem, we can use our simple for loop logic + recursion
func flattenedArray(array:[Any]) -> [Int] {
var myArray = [Int]()
for element in array {
if let element = element as? Int {
...