CallBack or Not for parameter within this.setState

[lasjorg]

Just as an aside, you do not have access to the event target inside the updater function with the version of React that the curriculum is using.

My React app don't work

You are not using the current state for the state update. This means the updater function is not needed and you should just be using an object. handleChange(event) { this.setState({ input: event.target.value }) } Next. The fCC React curriculum is using React v16.4.0 and because of how React 16 events work (pooling) the event target will be undefined inside the setState updater function. This is why it crashes when you type into the input Uncaught TypeError: Cannot read propert…