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How to handle an undefined variable in JSX conditional rendering?

asked 2021-12-01 11:00:00 +0000

qstack gravatar image

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answered 2022-12-24 11:00:00 +0000

pufferfish gravatar image

If you are rendering a component based on a condition which involves a variable that may be undefined, you can use an optional chain operator (?.) or a conditional operator (?:) to handle it.

Using Optional Chaining Operator (?.):

{variable?.condition && <Component />}

If variable is undefined, the condition will return false and the component will not be rendered.

Using Conditional Operator (?:):

{(variable ? variable.condition : false) && <Component />}

This statement checks whether variable is defined, and if so, checks the condition, otherwise returns false. If the condition is true, the component will be rendered.

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Asked: 2021-12-01 11:00:00 +0000

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Last updated: Dec 24 '22