Imagine this component
function AudioPlayer({
uri,
volume = 1.0,
onPlay = undefined <--- superfluous?
}) {
}
AudioPlayer.propTypes = {
uri: PropTypes.string.isRequired,
volume: PropTypes.number,
onPlay: PropTypes.func,
}
As you can see, onPlay is optional (as declared in the prop-types), but... is it correct (I mean, not superfluous) to set it as onPlay = undefined?
Or should I just do:
function AudioPlayer({
uri,
volume = 1.0,
onPlay,
}) {
}
In these type of situations, I don't declare it at all. If I want to declare it just to show that this will exist in future, I assign a default value type of what it will be. Like 0 for number, or empty string for type of string etc.