Setting encoding with open()
When opening a text file, you may specify it's encoding explicitly with a three-argument open(). This en-/decoder attached to a file handle is called an "I/O layer":
my $filename = '/path/to/file';
open my $fh, '<:encoding(utf-8)', $filename or die "...
If we need to parse a large file, e.g. a CSV more than 10 Mbytes containing millions of rows, some use file or file_get_contents functions and end up with hitting memory_limit setting with
Allowed memory size of XXXXX bytes exhausted
error. Consider the following source (top-1m.csv has exactly...
static and templates folder in the apps may should also contain a folder with the name of app ex. blog this is a convention used to prevent namespace pollution, so we reference the files like /blog/base.html rather than /base.html which provides more clarity about the file we are referencing and pre...
The coordinate systems of Matplotlib come very handy when trying to annotate the plots you make. Sometimes you would like to position text relatively to your data, like when trying to label a specific point. Other times you would maybe like to add a text on top of the figure. This can easily be achi...
In order for a program to react to a certain signal, other than using default action, custom signal handler can be installed using sigaction. sigaction receives three arguments - signal to act on, pointer to sigaction_t structure which, if not NULL, is describing new behaviour and pointer to sigacti...
Least squares is a standard approach to problems with more equations than unknowns, also known as overdetermined systems.
Consider the four equations:
x0 + 2 * x1 + x2 = 4
x0 + x1 + 2 * x2 = 3
2 * x0 + x1 + x2 = 5
x0 + x1 + x2 = 4
We can express this as a matrix multiplication A * x = b:
A ...
When rendering a form 'by hand', it can be useful to know if there are fields left to render or not.
The function isRendered() from the FormView class returns true if there are still fields left to be rendered to the template.
This snippet prints <h3>Extra fields</h3> if there are fiel...
There are dozens of character sets with hundreds of collations. (A given collation belongs to only one character set.) See the output of SHOW COLLATION;.
There are usually only 4 CHARACTER SETs that matter:
ascii -- basic 7-bit codes.
latin1 -- ascii, plus most characters needed for Western Eur...
You can add bounding distances on top of culling point radius. They are in a manner additional trigger conditions outside the culling points' main radius, like "close", "far" or "very far".
cullingGroup.SetBoundingDistances(new float[] { 0f, 10f, 100f});
Bounding ...
Consider using Extension Methods as Functions which wrap other code, here's a great example that uses both a static method and and extension method to wrap the Try Catch construct. Make your code Bullet Proof...
using System;
using System.Diagnostics;
namespace Samples
{
/// <summary&g...
You cam amend the time of a commit using
git commit --amend --date="Thu Jul 28 11:30 2016 -0400"
or even
git commit --amend --date="now"
If you make a commit as the wrong author, you can change it, and then amend
git config user.name "Full Name"
git config user.email "[email protected]"
git commit --amend --reset-author
What's between \Q and \E is treated as normal characters
#!/usr/bin/perl
my $str = "hello.it's.me";
my @test = (
"hello.it's.me",
"hello/it's!me",
);
sub ismatched($) { $_[0] ? "MATCHED!" : "DID NOT MATCH!" }
my @match = (
...
Extensions add new functionality to an existing class, structure, enumeration, or protocol type. This includes the ability to extend types for which you do not have access to the original source code.
Extensions in Swift can:
Add computed properties and computed type properties
Define instance ...
You can disable Lint checking from your Java and XML source files.
Configuring lint checking in Java
To disable Lint checking specifically for a Java class or method in your Android project, add the @SuppressLint annotation to that Java code.
Example:
@SuppressLint("NewApi")
@Override...
The following technique allows you to add your content to an HTML element and center it both horizontally and vertically without worrying about its height or width.
The outer container
should have display: table;
The inner container
should have display: table-cell;
should have vertical-al...
Similar to partial classes the new version of Visual Basic is now able to handle partial modules and partial interfaces. The syntax and behaviour is exactly the same as it would be for partial classes.
A partial module example:
Partial Module Module1
Sub Main()
Console.Write("Ping -&g...
