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How to match, but not capture, part of a regex?
...regular expression matches only apple or banana if it’s preceded by 123- and followed by -456, or it matches the empty string if it’s preceded by 123- and followed by 456.
|Lookaround | Name | What it Does |
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How to get access to HTTP header information in Spring MVC REST controller?
...rogramming in general, especially in Java, so I just learned what a header and body is.
3 Answers
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Determine if map contains a value for a key?
...s exist?
No. With the stl map class, you use ::find() to search the map, and compare the returned iterator to std::map::end()
so
map<int,Bar>::iterator it = m.find('2');
Bar b3;
if(it != m.end())
{
//element found;
b3 = it->second;
}
Obviously you can write your own getValue() r...
Convert Array to Object
...ectly into a new object: { ...[sortedArray]}
– HappyHands31
Jul 26 '19 at 15:18
4
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How to format strings in Java
...g.format, also take a look java.text.MessageFormat. The format less terse and a bit closer to the C# example you've provided and you can use it for parsing as well.
For example:
int someNumber = 42;
String someString = "foobar";
Object[] args = {new Long(someNumber), someString};
MessageForma...
A variable modified inside a while loop is not remembered
...I'm using some sort of copy of the variable $foo inside the while loop and I am modifying only that particular copy. Here's a complete test program:
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How can I reverse a list in Python?
...cing, such as range(1,4)[::-1], reversed() is easier to read, runs faster, and uses substantially less memory. "
– Jim Oldfield
Aug 20 '16 at 15:55
5
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Two arrays in foreach loop
... generate a selectbox using two arrays, one containing the country codes and another containing the country names.
22 Ans...
Ruby - elegantly convert variable to an array if not an array already
...ent, or nil, obtain an array - the latter two being a single element array and an empty array respectively.
10 Answers
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Loop through all nested dictionary values?
I'm trying to loop through a dictionary and print out all key value pairs where the value is not a nested dictionary. If the value is a dictionary I want to go into it and print out its key value pairs...etc. Any help?
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