The answer
Use the pattern that fits the case: an if statement before the return for complex logic, a ternary for either/or choices inside JSX, logical AND for show-if-true, and a switch or enum object for multiple cases.
Conditional Rendering in React: Patterns You Should Know
How do I conditionally render in React?
More FAQs in Conditional Rendering in React: Patterns You Should Know
Because && returns its left operand when it is falsy. If the left side is 0, React renders 0 instead of nothing. Be explicit about what you want to show, or convert the condition to a boolean.
For simple either/or choices where you render one of two things based on a condition. For more complex logic, compute the result before the return with an if statement to keep the JSX clean.
Yes. Returning null renders nothing. This is useful when a component should hide itself entirely based on a prop or state, without needing a wrapper element.
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