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README: clarify what "optional" means #324

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README: clarify what "optional" means #324

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2 changes: 1 addition & 1 deletion README.md
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Expand Up @@ -65,7 +65,7 @@ class MyComponent extends React.Component {

MyComponent.propTypes = {
// You can declare that a prop is a specific JS primitive. By default, these
// are all optional.
// are all optional - `undefined` and `null` are allowed.
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in addition, they can be omitted entirely (which is distinct from being present but undefined). let's note that too!

optionalArray: PropTypes.array,
optionalBool: PropTypes.bool,
optionalFunc: PropTypes.func,
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