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Regular vs Context Free Grammars
...ammar is either right or left linear, whereas context free grammar is basically any combination of terminals and non-terminals. Hence you can see that regular grammar is a subset of context-free grammar.
So for a palindrome for instance, is of the form,
S->ABA
A->something
B->something
...
What's the difference between array_merge and array + array?
...ruth regarding the OP). 2. See Yehosef's answer about what array_merge actually does... 3. And see BoltClock's answer about another crucial difference not mentioned here: array_merge resets numeric keys, unlike +.
– Sz.
Sep 20 '18 at 23:31
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How do you check if a JavaScript Object is a DOM Object?
...exception is thrown and we end up here. Testing some
//properties that all elements have (works on IE7)
return (typeof obj==="object") &&
(obj.nodeType===1) && (typeof obj.style === "object") &&
(typeof obj.ownerDocument ==="object");
}
}
It's part of ...
ManyRelatedManager object is not iterable
...
Try
matches = [val for val in Store.attribute_answers.all() if val in WishList.attribute_answers.all()]
Notice the parenthesis at the end of WishList.attribute_answers.all(). Adding the parenthesis invokes the all function to return an iterable.
If you include the parenthesi...
`require': no such file to load — mkmf (LoadError)
I was trying to install rails on Ubuntu Natty Narwhal 11.04, using ruby1.9.1.
10 Answers
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How to access command line parameters?
...he command line. fn main() is only shown with an empty parameter list in all examples.
11 Answers
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Authoritative position of duplicate HTTP GET query keys
...t you like.
Typical approaches include: first-given, last-given, array-of-all, string-join-with-comma-of-all.
Suppose the raw request is:
GET /blog/posts?tag=ruby&tag=rails HTTP/1.1
Host: example.com
Then there are various options for what request.query['tag'] should yield, depending on the...
What is a non-capturing group in regular expressions?
... Group 4: "sectetuer"
...
So, if we apply the substitution string:
$1_$3$2_$4
... over it, we are trying to use the first group, add an underscore, use the third group, then the second group, add another underscore, and then the fourth group. The resulting string would be like the one below....
How to make an HTML back link?
...way to create an <a> tag that links to the previous web page? Basically a simulated back button, but an actual hyperlink. Client-side technologies only, please.
...
Read/Write 'Extended' file properties (C#)
...thread at kixtart.org that has more information for other properties. Basically, you need to call the GetDetailsOf() method on the folder shell object for shell32.dll.
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