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Getting a list item by index
...sing c# moving over from Java. I can't seem to find how to get a list item by index. In java to get the first item of the list it would be:
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What is the overhead of creating a new HttpClient per call in a WebAPI client?
...ly closes the TCP/IP connection in the pool of connections that is managed by ServicePointManager. This means that each request with a new HttpClient requires re-establishing a new TCP/IP connection.
From my tests, using plain HTTP on a LAN, the performance hit is fairly negligible. I suspect thi...
Does setting Java objects to null do anything anymore?
I was browsing some old books and found a copy of "Practical Java" by Peter Hagger. In the performance section, there is a recommendation to set object references to null when no longer needed.
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What's the difference between UTF-8 and UTF-8 without BOM?
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The UTF-8 BOM is a sequence of bytes at the start of a text stream (0xEF, 0xBB, 0xBF) that allows the reader to more reliably guess a file as being encoded in UTF-8.
Normally, the BOM is used to signal the endianness of an encoding, but since endianness i...
How do I merge two javascript objects together in ES6+?
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You will be able to do a shallow merge/extend/assign in ES6 by using Object.assign:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign
Syntax:
Object.assign(target, sources);
where ...sources represents the source object(s).
Example...
jQuery access input hidden value
..._fields.attr( 'text' );
Will give you all hidden input fields and filter by those with a specific type="".
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What is the “FS”/“GS” register intended for?
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There is what they were intended for, and what they are used for by Windows and Linux.
The original intention behind the segment registers was to allow a program to access many different (large) segments of memory that were intended to be independent and part of a persistent virtual store....
How dangerous is it to access an array out of bounds?
... I read from outside the array (I now understand I then access memory used by some other parts of my program or even beyond that) or I am trying to set a value to an index outside of the array. The program sometimes crashes, but sometimes just runs, only giving unexpected results.
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What's the difference between identifying and non-identifying relationships?
...child table with respect to States. But a row in Person is not identified by its state attribute. I.e. state is not part of the primary key of Person.
A non-identifying relationship can be optional or mandatory, which means the foreign key column allows NULL or disallows NULL, respectively.
S...
What does it mean by select 1 from table?
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select 1 from table is used by some databases as a query to test a connection to see if it's alive, often used when retrieving or returning a connection to / from a connection pool.
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