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Showing content from https://webplatform.github.io/docs/javascript/Object/prototype below:

prototype · WebPlatform Docs

prototype Summary

Returns a reference to the prototype for a class of objects.

Syntax

objectName.prototype

Examples

The objectName argument is the name of an object.

Use the prototype property to provide a base set of functionality to a class of objects. New instances of an object “inherit” the behavior of the prototype assigned to that object.

For example, to add a method to the Array object that returns the value of the largest element of the array, declare the function, add it to Array.prototype , and then use it.

function array_max( ){
     var i, max = this[0];
     for (i = 1; i < this.length; i++)
     {
     if (max < this[i])
     max = this[i];
     }
     return max;
 }
 Array.prototype.max = array_max;
 var myArray = new Array(7, 1, 3, 11, 25, 9
 );
 document.write(myArray.max());

Remarks

All intrinsic JavaScript objects have a prototype property that is read-only. Properties and methods may be added to the prototype, but the object may not be assigned a different prototype. However, user-defined objects may be assigned a new prototype.

The method and property lists for each intrinsic object in this language reference indicate which ones are part of the object’s prototype, and which are not.