How would you implement real-time client-side validation in React?
Tests state-driven UI thinking over imperative DOM updates. A strong answer uses a status enum like typing or error, derives validation from state instead of redundant booleans, and conditionally renders feedback.
Tests whether you treat UI as a function of state rather than issuing imperative commands like show error or hide error. A strong answer declares visual states such as typing, validating, or error; computes validation messages from the current input value instead of duplicating that logic in separate state variables; and renders feedback conditionally based on the single status state. Red flag: creating independent isTooShort, isInvalidEmail, and errorMessage states that must be kept in sync manually, which invites bugs.
Read the original → react.dev
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