We also need to modify handleClick because the Game component’s state is structured differently. Within the Game’s handleClick method, we concatenate new history entries onto history. If we mutated the squares array, implementing time travel would be very difficult. We have changed this.props to props both times it appears. We’ll now change the Square to be a function component. Detecting changes in mutable objects is difficult because they are modified directly.
Section 1 Getting Started
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Keys tell React about the identity of each component which allows React to maintain state between re-renders. If a component’s key changes, the component will be destroyed and re-created with a new state. When we render a list, React stores some information about each rendered list item. When we update a list, React needs to determine what has changed. We could have added, removed, re-arranged, or updated the list’s items. Using the map method, we can map our history of moves to React elements representing buttons on the screen, and display a list of buttons to “jump” to past moves. Placing the history state into the Game component lets us remove the squares state from its child Board component.
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- Dynamic import – show you how to import a module dynamically via the function-like object import().
However, now the state is stored in the Board component instead of the individual Square components. When the Board’s state changes, the Square components re-render automatically. Keeping https://remotemode.net/ the state of all squares in the Board component will allow it to determine the winner in the future. We may think that Board should just ask each Square for the Square’s state.
- Go to your test site and create a new folder named scripts.
- A component takes in parameters, called props (short for “properties”), and returns a hierarchy of views to display via the render method.
- Introduction to TypeScript Generics – learn how to use TypeScript generics to develop generic functions.
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Section 8 Advanced Functions