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- Hello again and welcome to lesson 13.

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This lesson is all about generics.

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We begin with the basic syntax

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for generic structures
and generic functions.

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We'll see how to define
them and how to use them.

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Then, we'll move on to
discuss type constraints.

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Type constraints enable you
to specify basic requirements

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for type parameters.

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For example, you can
specify a type parameter

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must implement a certain
trait, so you can then depend

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on that trait's functionality
in your generic code.

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For the remainder of the
lesson, we'll take a look

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at some of the standard generic
traits in the Rust library.

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We'll take a look

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at generic traits named
PartialEq, Eq, Hash,

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PartialOrd and Ord, cryptic names I know.

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We discuss their role in Rust

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and we'll see how to implement
them in your structures.

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We'll wrap up the lesson
with a closer look

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at how closures work
internally inside Rust.

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It so happens that when
you write a closure,

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Rust converts it

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into a strap that
implements a generic trait.

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This enables you to pass closures

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as parameters into
function, as we shall see.