Question 385497 in Javascript Question posted in
A very good W3school tutorial can be found here.

Define a Static property of a Class (Object) with pseudoclassical inheritance javascript

I have been wrapping my head around pseudoclassical inheritance in Javascript , and continuing on this topic I wanted to set an Static property/method , for a defined Constructor function.
I want to avoid the class syntax for it.

function Food () {
    isEdible = true;
}

console.log(Food.isEdible); // undefined

I know this example is wrong

I am wondering how it has been done on the rest of the Javascript Object model, with methods so important like for instance

Array.of(element1, element2, /* …, */ elementN)

Which can be accessed without the need of Instanciating an Array

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2

Answers


  1. 0

    Just assign to the function:

    function Food () {
    
}

Food.isEdible = true;

console.log(Food.isEdible);
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  2. 0

    Array.of is a static method. The docs:

    The Array.of() static method creates a new Array instance from a variable number of arguments, regardless of number or type of the arguments.

    In class based inheritance, the way to write it would be:

    class Array {
  static alert(element) {
    alert(element);
  }
}

Array.alert('test');

    The equivalent of above in prototype inheritance is:

    Array.alert = function(element) {
  alert(element);
};

Array.alert('test');

    Playground to view the conversion in ES5

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