It is recommended create instances of JS engines by using the following methods of theIJsEngineSwitcher interface:CreateEngine andCreateDefaultEngine.In this case, instances of JS engines are created with the settings, that you specified during their registration.

CreateEngine method takes only one parameter - name of JS engine:

IJsEngineengine=JsEngineSwitcher.Current.CreateEngine("ChakraCoreJsEngine");

You can also use constant:

IJsEngineengine=JsEngineSwitcher.Current.CreateEngine(ChakraCoreJsEngine.EngineName);

Since the name of JS engine is a string value, then you can get it from an external source (for example, configuration file).This feature allows you to quickly switch a whole project to usage of the different JS engine.

CreateDefaultEngine method takes no parameters:

IJsEngineengine=JsEngineSwitcher.Current.CreateDefaultEngine();

Decision about which JS engine you need to create depends on the value of theDefaultEngineName property of theIJsEngineSwitcher interface.

You can also directly create instances of JS engines by using constructors:

IJsEngineengine=newChakraCoreJsEngine(newChakraCoreSettings{DisableEval=true,EnableExperimentalFeatures=true});

But choosing this approach, you lose all benefits of the JavaScript Engine Switcher infrastructure.