Q1. How does the logical AND (&&) operator work for conditional rendering?
In JSX, {condition && element} renders the element if condition is true. If condition is false, React ignores the element. This works because in JavaScript, true && expression returns expression, and false && expression returns false.
Q2. What happens if the left side of && is a number like 0?
If the left side is 0 (falsy), React renders 0 instead of nothing. This can cause unexpected output. To avoid this, ensure the left side is a boolean: {!!count &&
Items: {count}
} or {count > 0 && ...}.Q3. Can you use logical OR (||) for conditional rendering?
Yes, you can use || to provide a fallback: {data ||
No data
}. If data is falsy, the right side renders. This is useful for default values.Q4. Is it possible to chain multiple && operators?
Yes, you can chain them, but it can become hard to read. For multiple conditions, consider using ternary or separate variables.
Q5. What is a common pitfall with && and falsy values?
A common pitfall is using && with a number that could be 0. For example, {count &&
{count}
} will render 0 when count is 0. Always convert to boolean: {count > 0 &&{count}
}.