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Difference between a Postback and a Callback
...a couple of points. Postback is a term that gets introduced very recently by ASP .NET programming as Dreas explained, whereas callback is more generic and has been used way before web development exists. In fact I first heard about callback back in the days when I started programming in C (maybe t...
Key existence check in HashMap
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You won't gain anything by checking that the key exists. This is the code of HashMap:
@Override
public boolean containsKey(Object key) {
Entry<K, V> m = getEntry(key);
return m != null;
}
@Override
public V get(Object key) {
Entr...
Ruby, !! operator (a/k/a the double-bang) [duplicate]
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In most programming languages, including Ruby, ! will return the opposite of the boolean value of the operand. So when you chain two exclamation marks together, it converts the value to a boolean.
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Ruby: Can I write multi-line string with no concatenation?
...;<END_SQL.gsub(/\s+/, " ").strip
SELECT * FROM users
ORDER BY users.id DESC
END_SQL
# >> "SELECT * FROM users ORDER BY users.id DESC"
The latter would mostly be for situations that required more flexibility in the processing. I personally don't like it, it puts the processing...
Single vs Double quotes (' vs ")
I've always used single quotes when writing my HTML by hand. I work with a lot of rendered HTML which always uses double quotes. This allows me to determine if the HTML was written by hand or generated. Is this a good idea?
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What is the difference between and ? [duplicate]
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In case somebody else is confused by this answer: <jsp:include is dynamic (JspRuntimeLibrary), <%@include is static (out.write).
– eis
Oct 18 '13 at 6:56
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How to convert a dictionary to query string in Python?
...pping object or a sequence of two-element tuples, which may contain str or bytes objects, to a percent-encoded ASCII text string.
— Python 3 urllib.parse docs
A dict is a mapping.
Legacy Python
urllib.urlencode(query[, doseq])
Convert a mapping object or a sequence of two-elemen...
What does git push -u mean?
...inting out that the branch which is pushed to with git push isn't affected by the upstream branch configuration unless you have push.default set to tracking (or upstream in later versions of git).
– Mark Longair
Apr 22 '11 at 11:59
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Does a valid XML file require an XML declaration?
...utes, so if they are present they must be in that order: version, followed by any encoding, followed by any standalone.
<?xml version="1.0"?>
<?xml version="1.0" encoding="UTF-8"?>
<?xml version="1.0" standalone="yes"?>
<?xml version="1.0" encoding="UTF-16" standalone="yes"?>...
How to remove jar file from local maven repository which was added with install:install-file?
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The directory structure under .m2/repository is organized by Maven group ID, so you can just delete the subdirectory corresponding to the artifact you want to remove.
– Kevin Krumwiede
Aug 23 '16 at 19:33
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