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What does $$ mean in the shell?
...emp filename for a variety of reasons.
For temporary file names, use the mktemp command.
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Removing index column in pandas when reading a csv
...the second column to the variable "efficiency" the index column is also tacked on. How can I get rid of the index column?
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Why should hash functions use a prime number modulus?
A long time ago, I bought a data structures book off the bargain table for $1.25. In it, the explanation for a hashing function said that it should ultimately mod by a prime number because of "the nature of math".
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Java naming convention for static final variables [duplicate]
...ants that represent alternative values of a set, or,
less frequently, masking bits in an integer value, are sometimes
usefully specified with a common acronym as a name prefix, as in:
interface ProcessStates {
int PS_RUNNING = 0;
int PS_SUSPENDED = 1;
}
Obscuring involving constant na...
How to process POST data in Node.js?
...lar forms set to POST)
* and exposes the resulting object (containing the keys and values) on req.body
*/
app.use(bodyParser.urlencoded({
extended: true
}));
/**bodyParser.json(options)
* Parses the text as JSON and exposes the resulting object on req.body.
*/
app.use(bodyParser.json());
a...
Is There a Better Way of Checking Nil or Length == 0 of a String in Ruby?
Is there a better way than the following to check to see if a string is nil OR has a length of 0 in Ruby?
16 Answers
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Convert boolean to int in Java
... edited Apr 15 '18 at 18:23
kol
23.2k1010 gold badges6767 silver badges102102 bronze badges
answered Sep 25 '10 at 11:49
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How to specialize std::hash::operator() for user-defined type in unordered containers?
To support user-defined key types in std::unordered_set<Key> and std::unordered_map<Key, Value>
one has to provide operator==(Key, Key) and a hash functor:
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How to change JFrame icon [duplicate]
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Create a new ImageIcon object like this:
ImageIcon img = new ImageIcon(pathToFileOnDisk);
Then set it to your JFrame with setIconImage():
myFrame.setIconImage(img.getImage());
Also checkout setIconImages() which takes a List instead.
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How to write an inline IF statement in JavaScript?
...be minor if the value is true, and major if the value is false.
This is known as a Conditional (ternary) Operator.
https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Operators/Conditional_Operator
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