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JavaScript and ES6, "global" variables


JavaScript and ES6, "global" variables

By : Romulus
Date : November 22 2020, 09:00 AM
like below fixes the issue You can always assign variables to window.MyClass = whatever (global.MyClass for nodejs) no matter where you are, and access these values from any other file in your application. That's not always the best way to go about sharing data globally in your application though. The module loader in nodejs (or AMD in ES6) takes whatever you export and caches it. Lets say you have a file like:
MyModule.js:
code :
class MyClass {
  constructor() {
    this.someData = 55;
  }
}

export default (new MyClass);
import MyClass from './MyModule'
MyClass.someData = 100;
import MyClass from './MyModule'
console.log(MyClass.someData);


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Reference global variables in VBScript the same way as window["var_name"] in Javascript

Reference global variables in VBScript the same way as window["var_name"] in Javascript


By : user2529894
Date : March 29 2020, 07:55 AM
it fixes the issue There's nothing strictly equivalent.
If you want to dynamically access variables, you can use the Execute statement, which is similar to eval in other languages.
code :
Dim x, var_name

var_name = "x"
Execute var_name & " = 10"
WScript.Echo x  '' Prints 10
Dim x

Set x = GetRef("my_sub")
x

Sub my_sub
    WScript.Echo "Hello, world"
End Sub
JavaScript: Code sample of Global Variables "Use Strict" Explanation

JavaScript: Code sample of Global Variables "Use Strict" Explanation


By : user3390572
Date : March 29 2020, 07:55 AM
This might help you I am learning jquery and started my first attempt at building a form validation script based on what I know so far (which isnt much). ,
a. How best to remove the global variables using
code :
>   $rdoGroup = [], // an empty array which will be used to hold 
>     $rdoGroup.push($(this).attr("name"));
      $rdoGroup.push(this.name);
>     for (i = 0; i < $rdoGroup.length; i++) {               
>         if ($rdoGroup[c].toString() !== $(this).attr("name").toString()) {
global variables javascript, which is faster "varname" or "window.varname"

global variables javascript, which is faster "varname" or "window.varname"


By : Selfighter
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Try both of the codes below separately and see the results for yourself. Indeed this might not be the most accurate testcase however by avoiding all other manipulation and doing a simple assignment inside a long enough for loop it ought to be accurate enough.
I have to say I was also surprised to see that by not specifying window Chrome persistently reported about 20% faster execution for the second code.
code :
// window.testvar testcase.
window.testvar = 'Hi there! I am a testvar!';
var tmp;
var start = new Date();
for(var i = 0; i < 1000000; i++){
    tmp = window.testvar;
}
var stop = new Date();
console.log('This took exactlly ' + (stop.getTime() - start.getTime()) + ' milliseconds!');
// direct testvar testcase
testvar = 'Hi there! I am a testvar!';
var tmp;
var start = new Date();
for(var i = 0; i < 1000000; i++){
    tmp = testvar;
}
var stop = new Date();
console.log('This took exactlly ' + (stop.getTime() - start.getTime()) + ' milliseconds!');
“var” variables, "this" variables and "global" variables - inside a JavaScript Constructor

“var” variables, "this" variables and "global" variables - inside a JavaScript Constructor


By : benoit GUIVARCH
Date : March 29 2020, 07:55 AM
will be helpful for those in need Just to focus on the scope, I'm going to run through this example, (with clearer variables) Afterwards, I'll connect it back to your variables.
code :
var x = "Global scope";
var y = "Not changed.";

function Foo() {
    this.x = "Attribute of foo";
    var x = "In foo's closure";
    y = "Changed!"
    this.getX = function () { 
        return x;
    }
}

// do some logging

console.log(x); // "Global scope"
console.log(y); // "Not changed"
foo = new Foo();
console.log(y); // "Changed!"
console.log(foo.x); // "Attribute of foo"
console.log(x); // "Global scope"
console.log(foo.getX()); // "In foo's closure"
Importance of giving an initial value to the variables "Local or global " javascript

Importance of giving an initial value to the variables "Local or global " javascript


By : asif shaik
Date : March 29 2020, 07:55 AM
hop of those help? The first constructor does not create the formatLength field. It just try to get a non-existing field.
The second constructor creates the formatLength field.
code :
var o = {};
var u = o.youField; // u is set to undefined;
var o = { yourField :  undefined};
var o = { yourField :  null};
var Class = function data() {
    var self = this;
    self.formatLength =  null;
}
var c = new Class();
delete c.formatLength;
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