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Why .NET String is immutable? [duplicate]
...objects. For example, if you were implementing list which was backed by an array, a start index and a count, then the most expensive part of creating a sub-range would be copying the objects. However, if it was immutable then the sub-range object could reference the same array, with only the start i...
How to print pandas DataFrame without index
...print dataframe without an index" question, you can set the index to be an array of empty strings (one for each row in the dataframe), like this:
blankIndex=[''] * len(df)
df.index=blankIndex
If we use the data from your post:
row1 = (123, '2014-07-08 00:09:00', 1411)
row2 = (123, '2014-07-08 00...
Concat all strings inside a List using LINQ
... worked great for me! string.Join(", ", accs.Select(x => x.AccountID).ToArray()),
– m4tt1mus
Jul 8 '11 at 16:34
33
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How do I check if a string contains a specific word?
... use the answer in PHP, you can use this function:
function contains($str, array $arr) {
// Works in Hebrew and any other unicode characters
// Thanks https://medium.com/@shiba1014/regex-word-boundaries-with-unicode-207794f6e7ed
// Thanks https://www.phpliveregex.com/
if (preg_match(...
Getters \ setters for dummies
...ing to get it. I'm trying to assign a getter to the length property of an array object but getting an error: "Redeclaration of var length" And the code looks like this: obj = []; obj.__defineGetter__('length',function(){ return this.length; });
–...
PHP: How to remove all non printable characters in a string?
...ty efficient, but if you're doing this operation a lot, you could build an array of chars you want to remove, and use str_replace as noted by mgutt below, e.g.
//build an array we can re-use across several operations
$badchar=array(
// control characters
chr(0), chr(1), chr(2), chr(3), chr(...
Is it possible to use raw SQL within a Spring Repository
...port org.springframework.data.repository.CrudRepository;
import java.util.ArrayList;
public interface UserInfoTestDao extends CrudRepository<UserInfoTest,Integer> {
@Query(value = "select id,name,roll_no from USER_INFO_TEST where rollNo = ?1", nativeQuery = true)
ArrayList<IUserPr...
What is the difference between a HashMap and a TreeMap? [duplicate]
...
To sum up:
HashMap: Lookup-array structure, based on hashCode(), equals() implementations, O(1) runtime complexity for inserting and searching, unsorted
TreeMap: Tree structure, based on compareTo() implementation, O(log(N)) runtime complexity for inse...
What are the differences between Rust's `String` and `str`?
...g's data.
On the stack: e.g. the following creates a stack-allocated byte array, and then gets a view of that data as a &str:
use std::str;
let x: &[u8] = &[b'a', b'b', b'c'];
let stack_str: &str = str::from_utf8(x).unwrap();
In summary, use String if you need owned string...
How to read XML using XPath in Java
...mployees Name.
Source Code
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.xp...