How can a method be added to an object's prototype?

object.prototype.addMethod(methodName, method)
prototype.addMethod(object, methodName, method)
Object.prototype.methodName = method
object.methodName = method

To add a method to an object's prototype in JavaScript, you can assign the method to the prototype property of the constructor function that created the objects. For example, Object.prototype.methodName = method. This way, all objects created from that constructor will inherit the method. The other options do not follow the correct syntax for adding a method to a prototype.

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