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What is the difference between Strategy design pattern and State design pattern?
...s are passed to the context object as parameters, while States are created by the context object itself.
Strategies only handle a single, specific task, while States provide the underlying implementation for everything (or most everything) the context object does.
A "classic" implementation would ...
CSS selector by inline style attribute
Is there a CSS selector to select this element by its inline style attribute value?
2 Answers
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unix diff side-to-side results?
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From man diff, you can use -y to do side-by-side.
-y, --side-by-side
output in two columns
Hence, say:
diff -y /tmp/test1 /tmp/test2
Test
$ cat a $ cat b
hello hello
my name my name
is me ...
How do you get a directory listing sorted by creation date in python?
What is the best way to get a list of all files in a directory, sorted by date [created | modified], using python, on a windows machine?
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Removing Data From ElasticSearch
...ly remove the data itself. The other stuff I've seen points to the Delete by Query feature. However, I'm not even sure what to query on. I know my indexes. Essentially, I'd like to figure out how to do a
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How do I select an element in jQuery by using a variable for the ID?
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Doing $('body').find(); is not necessary when looking up by ID; there is no performance gain.
Please also note that having an ID that starts with a number is not valid HTML:
ID and NAME tokens must begin with a letter ([A-Za-z]) and may be followed by any number of letters, di...
Random “Element is no longer attached to the DOM” StaleElementReferenceException
... Consider the following scenario:
WebElement element = driver.findElement(By.id("foo"));
// DOM changes - page is refreshed, or element is removed and re-added
element.click();
Now at the point where you're clicking the element, the element reference is no longer valid. It's close to impossible f...
Split a string by spaces — preserving quoted substrings — in Python
..., because regex syntax can easily describe "whitespace or thing-surrounded-by-quotes", and most regex engines (including Python's) can split on a regex. So if you're going to use regexes, why not just say exactly what you mean?:
test = 'this is "a test"' # or "this is 'a test'"
# pieces = [p for ...
How do I use reflection to call a generic method?
...eed to use reflection to get the method to start with, then "construct" it by supplying type arguments with MakeGenericMethod:
MethodInfo method = typeof(Sample).GetMethod(nameof(Sample.GenericMethod));
MethodInfo generic = method.MakeGenericMethod(myType);
generic.Invoke(this, null);
For a stati...
Why declare a struct that only contains an array in C?
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It allows you to pass the array to a function by value, or get it returned by value from a function.
Structs can be passed by value, unlike arrays which decay to a pointer in these contexts.
sha...