How to avoid duplicated class definitions in JS

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I declared a class in my script as following;

class XYPT {
constructor(x, y) {
this.x = x;
this.y = y;
}
}

For some reasons, I have to load this script several times with jquery getscript method. When I try to define this class, it gives me an error 'Identifier 'XYPT' has already been declared'.

Is it possible to check if a class is declared before? I'm looking for something like this,

(isDeclaredBefore(XYPT))
{
//do nothing
}
else
{
  class XYPT {
    constructor(x, y) {
    this.x = x;
    this.y = y;}
  }
}

you can check if the class is already defined like this.

class foo {

}

// check it, if it is defined
if ( typeof foo === 'function' ) 
{
  console.log('defined'); // write you logic here
}
else 
 {
   // otherwise, something here
   console.log('not')
 } 
  
  

let per = new foo();

How to prevent duplicate JavaScript Variables Declaration?, To prevent duplicate variable declaration in JavaScript, wrap your variable declaration with a function expression:(function(){ var rank = 1; }� You can use the JavaScript built in object Set to keep unique values of any type. You can make use of ES6 Set to remove duplicate from an array. Here is how the code looks: function removeDuplicateUsingSet(arr){ let unique_array = Array.from(new Set(arr)) return unique_array } console.log(removeDuplicateUsingSet(array_with_duplicates));


You can put use the class expression in ecmascript 2015 as mentioned here

class foo {
    constructor(x, y) {
        this.x = x;
        this.y = y;
    }
}
if (typeof foo === "function") {
    var bar = class { // this is another way of defining classes but otherwise it won't work
        constructor(y) {
            this.y = y;
        }
    };
}
if (typeof bar === "function") {
    var baz = class {
        constructor(z) {
            this.z = z;
        }
    };
}
if (typeof baz === "function") {
    var b2 = new baz(13);
    console.log(b2.z);
}

JavaScript: Property names should not be duplicated within a class , Functions should not be defined inside loops Class methods should be used instead of "prototype" assignments String literals should not be duplicated Short-circuit logic should be used to prevent null pointer dereferences in� In avoiding duplicate bindings you don't want to accidentally unbind something if there is supposed to be more than one function bound to an event. This is especially important when you are working on something with multiple developers. To prevent this you can use event namespacing: //assuming this is a jquery object.


I figured that best way to avoid redeclaration of a class is to exclude it from the repeating script file, and declare it in another script which called before the repeating script.

Duplicate class names are removed by Meteor � Issue #1526 , I use semantic ui and i need a class definition like - "ui middle aligned enough to support space separated class names in Ambersand JS class and Meteor will not remove any duplicate classes since there will be none. In a smaller library project I just duplicated but I want to avoid that this time. I figured the way to do it was to have my files in src/ refer to the index.d.ts which will be exported with the JS lib but this does not work.


Duplicate Code, Duplication usually occurs when multiple programmers are working on different parts of the same program at If duplicate code is found in two different classes:. If duplicate code is found in two different classes: If the classes aren’t part of a hierarchy, use Extract Superclass in order to create a single superclass for these classes that maintains all the previous functionality. If it’s difficult or impossible to create a superclass, use Extract Class in one class and use the new component in the other.


How to avoid duplicate classes for product flavors?, What is the proper way to have various classes and avoid duplicate class error? I have a similar problem, where I have some constant definitions file which� Class Definition. Use the keyword class to create a class, and always add the constructor() method.. The constructor method is called each time the class object is initialized.


js duplicate class object Code Example, myObjectToCopy = JSON.parse(JSON.stringify(classReference)); //Converting class to a string then turning that string into an object. 13. } 14. . I have a problem with duplicate javascript functions. I am making widgets for websites. the problem is when they add 2 widgets, they get duplicate javascript functions and the first function get all messed up. is there a way to do something like this: