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In this video we're going to start to discuss interfaces in typescript.

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So as usual we'll get a plain definition.

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Some examples and so on.

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As a quick aside here we're going to spend a pretty good amount of time and typescript talking about

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interfaces the interplay between interfaces and classes is how we're going to really get very strong

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code reuse when we are writing typescript code.

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So if you understand interfaces really well it's going to help you design really excellent applications.

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As a matter of fact the entire second half of this course where we're going to work on a lot of applications

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is really going to come down to understanding how we can get interfaces and classes to work together

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really really nicely so if you don't understand this first take through interfaces totally fine because

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we're going to be discussing them quite a bit.

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All right.

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So with that in mind let's take a look at a quick definition here.

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So when we have interfaces we are going to write out some amount of code to define a new type inside

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of application.

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The goal this new type is to describe the different property names and a different property types that

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that object has so when we create an interface we are creating a new type inside of application just

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the same way that we have types like string or boolean or no.

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We're creating another new type.

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It's a custom type that you and I are going to define understanding interfaces is a lot easier when

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you have some code in front of you.

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So let's do a quick pause right here.

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Come back in the next video and start to write out some examples.