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

getPrototypeOf · WebPlatform Docs

getPrototypeOf Summary

Returns the prototype of an object.

Syntax

Object.getPrototypeOf( object )

object: Required. The object that references the prototype.

Return Value

The prototype of the object argument. The prototype is also an object.

Examples

The following example illustrates the use of the Object.getPrototypeOf function.


 function Pasta(grain, width) {
     this.grain = grain;
     this.width = width;
 }
 
 var spaghetti = new Pasta("wheat", 0.2);

 
 var proto = Object.getPrototypeOf(spaghetti);

 
 
 proto.foodgroup = "carbohydrates";
 document.write(spaghetti.foodgroup + " ");

 
 
 var result = (proto === Pasta.prototype);
 document.write(result + " ");

 
 
 var result = proto.isPrototypeOf(spaghetti);
 document.write(result);

The following example uses the Object.getPrototypeOf function to validate data types.

var reg = /a/;
 var result = (Object.getPrototypeOf(reg) === RegExp.prototype);
 document.write(result + " ");

 var err = new Error("an error");
 var result = (Object.getPrototypeOf(err) === Error.prototype);
 document.write(result);

Exceptions

If the object argument is not an object, a TypeError exception is thrown.