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There was a lot of talking about interfaces and classes now.

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Now let's look under the hood and see what javascript actually produces or offers as an alternative

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to interface.

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We learned that four class code Indiana depends on the word you were compiling for if you compile for

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iOS 6 year in it he has conflict then our output would use the class keyword since we compile 4 is 5

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here We instead see this work around using constructor functions in the end.

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What however happens for interfaces.

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Well let's have a look at the app J File and there you see nothing.

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You'll not see any translations for our interfaces.

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Add a friend named readable you don't find these things anywhere in app J.S. you just find our function

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here you find our constructor function for the person object.

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So basically that translation for the person class anti Abra code you find no reference at any interface

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and there's a good reason for that.

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There is no translation for interfaces javascript doesn't know about this feature.

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It's a pure typescript feature only available during development and compilation so you can use it to

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improve your code.

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No output for that will end up in your javascript files though so therefore it's a pure development

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feature helping you to write better code.

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Clearly structured code following clear rules at runtime no trace will be left of these interfaces.

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You'll not see anything related to the interfaces in your code only functions classes and all the other

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code is compiled and output interfaces are simply dumped.

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You could say they're used during compilation to check your code and then they're ignored.

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There is nothing that would be output for them.