Ask Your Question

How to handle an undefined variable in JSX conditional rendering?

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

qstack gravatar image

edit retag flag offensive close merge delete

1 Answer

Sort by ยป oldest newest most voted

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.

edit flag offensive delete link more

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account. This space is reserved only for answers. If you would like to engage in a discussion, please instead post a comment under the question or an answer that you would like to discuss

Add Answer

Question Tools


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

Seen: 1 times

Last updated: Dec 24 '22