Implement state with the useState hook

- [Instructor] In this video we're going … to implement State for the first time … with the help of React's useState hook. … Hooks are a relatively recent and nifty addition to React. … Their function is to let your function components … access features that used to be accessible … only by class components. … State is one of those features, and as we know, … state lets the component track the condition of data … and update itself when those data change. … So all that said, let's give this a whirl. … Looking at how things are right now, … there are a few pieces of data … that we're going to need to track. … Let's go with the current color of the shoe, … the currently selected size, … and all of the sizes that are available. … We're using a hard coded data source right now … for all of these sizes, but theoretically they might change … if we were accessing an API, so we'll treat them … as something that might be changeable at some point. … So current color, current size, all sizes. … Over here in my code, we're going to scroll down …