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How do I declare an array of weak references in Swift?
...lace(objects.map { WeakObject(object: $0) })
}
}
Usage
var alice: NSString? = "Alice"
var bob: NSString? = "Bob"
var cathline: NSString? = "Cathline"
var persons = WeakObjectSet<NSString>()
persons.addObject(bob!)
print(persons.allObjects) // [Bob]
persons.addObject(bob!)
print(person...
Get model's fields in Django
... and each element is a Model field type, which can't be used directly as a string. So, field.name will return the field name
my_model_fields = [field.name for field in MyModel._meta.get_fields()]
The above code will return a list conatining all fields name
Example
In [11]: from django.contrib.aut...
What is “callback hell” and how and why does RX solve it?
...appens after B is called listening to 'aFinished'. You can then easily add extra steps or extend this kind of behaviour, and can easily test that your code executes in order by merely broadcasting events in your test case.
s...
How to define a custom ORDER BY order in mySQL
...an ENUM column specifically it will use that internal index instead of the string values ( unless CAST() is used to make it back to a VARCHAR)
– Simon at My School Portal
Mar 26 '15 at 9:36
...
Read entire file in Scala?
...
val lines = scala.io.Source.fromFile("file.txt").mkString
By the way, "scala." isn't really necessary, as it's always in scope anyway, and you can, of course, import io's contents, fully or partially, and avoid having to prepend "io." too.
The above leaves the file open, h...
How to suppress scientific notation when printing float values?
...ate
Starting in Python 3.6, this can be simplified with the new formatted string literal, as follows:
>>> f'{a:.20f}'
'-0.00000000000000007186'
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How can I use xargs to copy files that have spaces and quotes in their names?
... of the files have spaces and single-quotes in their names. When I try to string together find and grep with xargs , I get the following error:
...
Git Cherry-pick vs Merge Workflow
...e. (As a minor secondary issue the new cherry-picked commits will take up extra space if someone else cherry-picks in the same commit again, as they will both be present in the history even if your working copies end up being identical.)
Ease of use. People tend to understand the merge workflow fa...
Instance attribute attribute_name defined outside __init__
...ion has the merit to avoid another warning caused when you declare self.my_string:str = None => "Expected type 'str' got None instead. Am curious if str() takes more memory than None, and why this solution is less pythonic if it avoids an IDE warning...
– Nono London
...
Multiple “order by” in LINQ
...umn, as follows.
var movies = _db.Movies.OrderBy( m => (m.CategoryID.ToString() + m.Name))
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