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Sorting multiple keys with Unix sort
I have potentially large files that need to be sorted by 1-n keys. Some of these keys might be numeric and some of them might not be. This is a fixed-width columnar file so there are no delimiters.
...
Performance difference between IIf() and If
..."Hello")
' Usage 2
Dim foo = If(result, "Alternative")
The first is basically C#'s ternary conditional operator and the second is its coalesce operator (return result unless it’s Nothing, in which case return "Alternative"). If has thus replaced IIf and the latter is obsolete.
Like in C#, VB's ...
How can I push a specific commit to a remote, and not previous commits?
... commits, not to be confused with the top, first, or tip commit, which are all ambiguous descriptions in my opinion. The commit needs to the oldest of your commits, i.e. the furthest from your most recent commit. If it's not the oldest commit then all commits from your oldest, local, non-pushed SHA ...
Best practices/performance: mixing StringBuilder.append with String.concat
...t can fit both s1 and s2. Copies s1 and s2 contents to this new array. Actually requires less work then + operator.
StringBuilder.append()
Maintains an internal char[] array that grows when needed. No extra char[] is created if the internal one is sufficiently big.
stringBuilder.append(s1.concat(...
SQLite with encryption/password protection
...MyDatabase.sqlite;Version=3;Password=password;");
conn.Open();
This wont allow any GUI editor to view Your data.
Later if you wish to change the password, use conn.ChangePassword("new_password");
To reset or remove password, use conn.ChangePassword(String.Empty);
...
Returning IEnumerable vs. IQueryable
...ecution.
The difference is that IQueryable<T> is the interface that allows LINQ-to-SQL (LINQ.-to-anything really) to work. So if you further refine your query on an IQueryable<T>, that query will be executed in the database, if possible.
For the IEnumerable<T> case, it will be L...
Difference between const & const volatile
...mize or reorder access to the object.
In an embedded system, this is typically used to access hardware registers that can be read and are updated by the hardware, but make no sense to write to (or might be an error to write to).
An example might be the status register for a serial port. Various b...
what is faster: in_array or isset? [closed]
... value until it finds a match.
Being an opcode, it has less overhead than calling the in_array built-in function.
These can be demonstrated by using an array with values (10,000 in the test below), forcing in_array to do more searching.
isset: 0.009623
in_array: 1.738441
This builds on Jason...
Why is the C++ STL is so heavily based on templates? (and not on *interfaces*)
...OOP code, but it also had a turing-complete template language overlaid, it allowed compile-time metaprogramming, and people had discovered generic programming. Suddenly, OOP just didn't seem all that important. Not when we can write simpler, more concise and more efficient code by using techniques a...
Building vs. Compiling (Java)
...
The "Build" is a process that covers all the steps required to create a "deliverable" of your software. In the Java world, this typically includes:
Generating sources (sometimes).
Compiling sources.
Compiling test sources.
Executing tests (unit tests, integrat...