Copy the prototype methods of the given constructor method into the given context, if they do not already exist.

assignPrototypeMethods.js

const assignPrototypeMethods = ( constructorMethod, context ) => {
	// Loop over the BaseController's prototype methods and assign them to the current context
	for ( var methodName in constructorMethod.prototype ) {
		if (constructorMethod.prototype.hasOwnProperty( methodName ) && !context[ methodName ]) {
			// Copy the method into the current controller context.
			context[ methodName ] = constructorMethod.prototype[ methodName ];
		}
	}
}