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How to update a value, given a key in a hashmap?
...method and supply it a mapping function, which will be called to compute a new value based on existing one.
For example,
Map<String, Integer> words = new HashMap<>();
words.put("hello", 3);
words.put("world", 4);
words.computeIfPresent("hello", (k, v) -> v + 1);
System.out.println(w...
Checking if an object is null in C#
...taList.
You need to create one with
public List<Object> dataList = new List<Object>();
Even better: since it's a field, make it private. And if there's nothing preventing you, make it also readonly. Just good practice.
Aside
The correct way to check for nullity is if(data != null)....
How to post pictures to instagram using API
... $sig = GenerateSignature($data);
$new_data = 'signed_body='.$sig.'.'.urlencode($data).'&ig_sig_key_version=4';
// Now, configure the photo
$conf = SendRequest('media/configure/', true, $new_data, $agent, true...
Deleting all files from a folder using PHP?
...h using the Standard PHP Library (SPL).
$dir = "path/to/directory";
$di = new RecursiveDirectoryIterator($dir, FilesystemIterator::SKIP_DOTS);
$ri = new RecursiveIteratorIterator($di, RecursiveIteratorIterator::CHILD_FIRST);
foreach ( $ri as $file ) {
$file->isDir() ? rmdir($file) : unlink(...
Sort array of objects by string property value
...properties starting with a "-" (extremely unlikely and probably not a good idea), you'll need to modify the dynamicSort function to use something else as a reverse sort indicator.
– Ege Özcan
Jan 10 '13 at 15:18
...
Is volatile expensive?
...an that volatile read operations can be done without a explicit cache invalidation on x86, and is as fast as a normal variable read (disregarding the reordering constraints of volatile)?
...
Add a column to existing table and uniquely number them on MS SQL Server
...or SQL Server, this could be achieved as follows:
alter table Example
add NewColumn int identity(1,1)
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Why do I have to access template base class members through the this pointer?
...unction () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f4643074%2fwhy-do-i-have-to-access-template-base-class-members-through-the-this-pointer%23new-answer', 'question_page');
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)...
What's the best way to get the last element of an array without deleting it?
... code on line 1
Based on this output I draw the following conclusions:
newer versions of PHP perform better with the exception of these options that became significantly slower:
option .6. $x = end((array_values($array)));
option .8. $keys = array_keys($array); $x = $array[$keys[count($keys)-1...
Parsing CSV files in C#, with header
...use - kudos to the team. I'm planning a blog on it soon and btw - Love the new site - well done!
– Sudhanshu Mishra
Jul 22 '15 at 23:52
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