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How to change Hash values?
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my_hash.each { |k, v| my_hash[k] = v.upcase }
or, if you'd prefer to do it non-destructively, and return a new hash instead of modifying my_hash:
a_new_hash = my_hash.inject({}) { |h, (k, v)| h[k] = v.upcase; h }
This last version has the added benefit that you could transform the keys too...
How can I add an item to a IEnumerable collection?
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You cannot, because IEnumerable<T> does not necessarily represent a collection to which items can be added. In fact, it does not necessarily represent a collection at all! For example:
IEnumerable<string> ReadLines()
{
string s;
do
{
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Multiline strings in VB.NET
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how can you do variable replacements in there? like " a=" & someint & ","
– Christopher Mahan
Mar 30 '11 at 23:28
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Finding all cycles in a directed graph
...orithm which lists all (elementary) cycles of a directed graph. It is from Donald B. Johnson and the paper can be found in the following link:
http://www.cs.tufts.edu/comp/150GA/homeworks/hw1/Johnson%2075.PDF
A java implementation can be found in:
http://normalisiert.de/code/java/elementaryCycles...
What is the difference between a reference type and value type in c#?
...eap object or a variable/field (struct). In practice, while structs which do not expose their fields can implement any kind of semantics, the fact that .net allows promiscuous sharing of heap references means heap objects cannot implement mutable value semantics.
– supercat
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In VIM, how do I break one really long line into multiple lines?
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Vim does this very easy (break lines at word boundaries).
gq{motion} % format the line that {motion} moves over
{Visual}gq % format the visually selected area
gqq % format the current line
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I'd suggest you check out ...
How do I get the information from a meta tag with JavaScript?
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You can use this:
function getMeta(metaName) {
const metas = document.getElementsByTagName('meta');
for (let i = 0; i < metas.length; i++) {
if (metas[i].getAttribute('name') === metaName) {
return metas[i].getAttribute('content');
}
}
return '';
}
console.log...
How do you access the matched groups in a JavaScript regular expression?
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@ianaz: I don't believe 'tis true? http://jsfiddle.net/weEg9/ seems to work on Chrome, at least.
– spinningarrow
Oct 16 '12 at 7:26
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How do I read CSV data into a record array in NumPy?
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You can use Numpy's genfromtxt() method to do so, by setting the delimiter kwarg to a comma.
from numpy import genfromtxt
my_data = genfromtxt('my_file.csv', delimiter=',')
More information on the function can be found at its respective documentation.
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Should I use a class or dictionary?
...at is mostly because that's what we like to enumerate together. i actually do think that the widespread use of classes to keep data is an abuse of oop; when you tghink about serialization issues, you can easily see why.
– flow
Feb 19 '11 at 19:39
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