How to Create a Global Variable

Using global variables in a function

You can use a global variable within other functions by declaring it as global within each function that assigns a value to it:

globvar = 0

def set_globvar_to_one():
    global globvar    # Needed to modify global copy of globvar
    globvar = 1

def print_globvar():
    print(globvar)     # No need for global declaration to read value of globvar

set_globvar_to_one()
print_globvar()       # Prints 1

Since it's unclear whether globvar = 1 is creating a local variable or changing a global variable, Python defaults to creating a local variable, and makes you explicitly choose the other behavior with the global keyword.

See other answers if you want to share a global variable across modules.

How to create a global variable in jQuery

jQuery library is build from JavaScript. Here is how to create global variable in JavaScript.

var data = ["wake up","eat breakfast","code"];

alert(data[0]);  // will display "wake up"

How to make global variables in php

Your question is kinda ambiguous for me. If you mean setting a variable from one file then making it available from all your php files you can put it in one file then include the file it in all your scripts. Put it on the top. Or you can put it inside an $_SESSION variable. This is the simplest solution I know. :)

Sample: Assuming all files are in the root directory

vars.php:

$globalVar = 2;
//or 
$_SESSION['global_var'] = 2; // if a session exists

otherfile.php:

include 'vars.php';
echo $globalVar; //outputs 2
//or
echo $_SESSION['global_var']; //outputs 2

I'm not sure if this is what you are trying to achieve :D

Global variables in Java

To define Global Variable you can make use of static Keyword

public class Example {
    public static int a;
    public static int b;
}

now you can access a and b from anywhere
by calling

Example.a;

Example.b;

How to create a global variable for render_template()?

I found the correct solution to my question in the Flask documentation:

Context Processors
To inject new variables automatically into the context of a template, context processors exist in Flask. Context processors run before the template is rendered and have the ability to inject new values into the template context. A context processor is a function that returns a dictionary. The keys and values of this dictionary are then merged with the template context, for all templates in the app:

@app.context_processor
def inject_user():
    return dict(user=g.user)

The context processor above makes a variable called user available in the template with the value of g.user. This example is not very interesting because g is available in templates anyways, but it gives an idea how this works.

How to create a global variable in ASP.NET Core Web API application?

First of all thank you all for finding some time to help me. I took @pm100's solution and made a slight modification to suit my purpose. I could not use it directly as I am using SonarLint and it was showing some issues. So I used a KeyValuePair instead of Dictionary like this:

public static class GlobalData
{
  public static KeyValuePair<string,object> Application { get; set; }
}

and I used it in my code like:

string value = GlobalData.Application.Value

and luckily it works without any issue.

Create a global variable in TypeScript

Okay, so this is probably even uglier that what you did, but anyway...

^{but I do the same so...}

What you can do to do it in pure TypeScript, is to use the eval function like so :

declare var something: string;
eval("something = 'testing';")

And later you'll be able to do

if (something === 'testing')

This is nothing more than a hack to force executing the instruction without TypeScript refusing to compile, and we declare var for TypeScript to compile the rest of the code.

How to create global variables once when app is launched in Go?

A global var starts with a capital, so it is reachable from within other packages.

But... it's actually bad behaviour, because those other packages can change it.

Having a non capital one, still means that functions in the same package can change it.

Perhaps you can use a constant?

or make a singleton variable, see :

https://goplay.tools/snippet/9k7FLYbbvoo