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What is the difference between the bridge pattern and the strategy pattern?
...UML
Strategy Pattern in Swift:
protocol PrintStrategy {
func print(_ string: String) -> String
}
class Printer {
let strategy: PrintStrategy
init(strategy: PrintStrategy) {
self.strategy = strategy
}
func print(_ string: String) -> String {
return self.strategy....
What's the advantage of a Java enum versus a class with public static final fields?
...n way without using instanceof, potentially confusing if sequences, or non-string/int switching values. The canonical example is a state machine.
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SQLite add Primary Key
...(i.e. sqlite_autoindex_XXX_1, where XXX is the table name) and set the sql string to NULL. At last change the table definition itself.
One pittfal: sqlite does not see the index name change until the database is reopened. This seems like a bug, but not a severe one (even without reopening the databa...
Why dict.get(key) instead of dict[key]?
...to False in a boolean context (i.e. a Falsey value), such as 0 or an empty string, '', then dictionary.get("bogus") or my_default would evaluate to my_default whereas dictionary.get("bogus", my_default) would return the Falsey value. So no, dictionary.get("bogus") or my_default is not equivalent to ...
How do I write the 'cd' command in a makefile?
...you add a backslash and a newline. This is due to the fact that the entire string is parsed as a single line by the shell. As noted in the comments, you should use '&&' to join commands, which mean they only get executed if the preceding command was successful.
all:
cd some_dir &...
When to use RDLC over RDL reports?
...flexibility.
You can configure parts of a report to be used for connection strings as 'Data Sources' as well as a sql query, xml, or other datasets as a 'Dataset'. These parts and others can be stored and configured to cache data on a regular basis.
You can write .NET proxy classes of the services ...
What exactly does += do in python?
... # empty list
x += "something" # iterates over the string and appends to list
print(x) # ['s', 'o', 'm', 'e', 't', 'h', 'i', 'n', 'g']
versus
x=[] # empty list
x = x + "something" # TypeError: can only concatenate list (not "str") to list...
Extract file name from path, no matter what the os/path format
...k), similar to how \r or \n signify newline/carriage return. Prefixing the string with r"C:\..." means use the given raw input
– Bruce Lamond
Jan 31 '17 at 0:53
...
Django Setup Default Logging
...it out...
You set the 'catch all' logger by referencing it with the empty string: ''.
As an example, in the following setup I have the all log events getting saved to logs/mylog.log, with the exception of django.request log events which will be saved to logs/django_request.log. Because 'propagate'...
Can Powershell Run Commands in Parallel?
...($i=1; $i -le 3; $i++) {
$ScriptBlock = {
Param (
[string] [Parameter(Mandatory=$true)] $increment
)
Write-Host $increment
}
Start-Job $ScriptBlock -ArgumentList $i
}
Get-Job | Wait-Job | Receive-Job
...