myDebt := 9000
index := RegExMatch("You owe me $42", "\$(\d+)", dollars)
if(index > 0) { ; indices are usually 1-based in AHK
myDebt += dollars1
MsgBox, Current debt: %myDebt%
}
Result:
Current debt: 9042
myString := " hello, Trim()! "
trimmed := Trim(myString)
FileAppend, % trimmed "`n", TrimmedStrings.txt
Note that Trim() will not manipulate the original string, but return a new one which should be stored or output somewhere.
Due to the way the Tcl language parser works, braces in the code must be properly matched. This includes the braces in comments.
proc hw {} {
# this { code will fail
puts {hello world}
}
A missing close-brace: possible unbalanced brace in comment error will be thrown.
proc hw {} {
...
The CharField is used for storing defined lengths of text. In the example below up to 128 characters of text can be stored in the field. Entering a string longer than this will result in a validation error being raised.
from django.db import models
class MyModel(models.Model):
name = models...
Introduction
Binary Search is a Divide and Conquer search algorithm. It uses O(log n) time to find the location of an element in a search space where n is the size of the search space.
Binary Search works by halving the search space at each iteration after comparing the target value to the middle ...
You can use the following code for going back and forward.
if (!function_exists('codepoint_encode')) {
function codepoint_encode($str) {
return substr(json_encode($str), 1, -1);
}
}
if (!function_exists('codepoint_decode')) {
function codepoint_decode($str) {
re...
You can use the following code for going back and forward.
if (!function_exists('mb_internal_encoding')) {
function mb_internal_encoding($encoding = NULL) {
return ($from_encoding === NULL) ? iconv_get_encoding() : iconv_set_encoding($encoding);
}
}
if (!function_exists('mb_c...
When localizing different types of resources are required, each of which has its own home in the android project structure.
Following are the different directories that we can place under the \res directory. The resource types placed in each of these directories are explained in the table below:
D...
Each resource directory under the res folder (listed in the example above) can have different variations of the contained resources in similarly named directory suffixed with different qualifier-values for each configuration-type.
Example of variations of `` directory with different qualifier value...
C and C++ are well known as high-performance languages - largely due to the heavy amount of code customization, allowing a user to specify performance by choice of structure.
When optimizing it is important to benchmark relevant code and completely understand how the code will be used.
Common opti...
Optimizing by using the right data structures at the right time can change the time-complexity of the code.
// This variant of stableUnique contains a complexity of N log(N)
// N > number of elements in v
// log(N) > insert complexity of std::set
std::vector<std::string> stableUnique...
Save the session variable as a variable.
$session = Yii::$app->session;
$sess = $session['keys'];
Then create or update the array value you want
$sess['first'] = 'abc';
And finally save to the session variable
$session['keys'] = $sess
Returns true or false, which indicates whether the regexp is matched or not without updating $~ and other related variables. If the second parameter is present, it specifies the position in the string to begin the search.
/R.../.match?("Ruby") #=> true
/R.../.match?("Ruby"...
When storing JSON documents in SQL Server, We need to be able to efficiently filter and sort query results on properties of the JSON documents.
CREATE TABLE JsonTable
(
id int identity primary key,
jsonInfo nvarchar(max),
CONSTRAINT [Content should be formatted as JSON]
CHECK...
Creating a dictionary:
set mydict [dict create a 1 b 2 c 3 d 4]
dict get $mydict b ; # returns 2
set key c
set myval [dict get $mydict $key]
puts $myval
# remove a value
dict unset mydict b
# set a new value
dict set mydict e 5
Dictionary keys can be nested.
dict set mycars mustang colo...
Use a mutex to synchronise access to a variable which is accessed from multiple threads:
counter = 0
counter_mutex = Mutex.new
# Start three parallel threads and increment counter
3.times.map do |index|
Thread.new do
counter_mutex.synchronize { counter += 1 }
end
end.each(&:joi...
Abstraction is a process of hiding the implementation details and showing only functionality to the user. An abstract class can never be instantiated. If a class is declared as abstract then the sole purpose is for the class to be extended.
abstract class Car
{
abstract void tagLine();
}
...
Synchronized modifier is used to control the access of a particular method or a block by multiple threads. Only one thread can enter into a method or a block which is declared as synchronized. synchronized keyword works on intrinsic lock of an object, in case of a synchronized method current objects...
A variable which is declared as transient will not be serialized during object serialization.
public transient int limit = 55; // will not persist
public int b; // will persist
