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Error Handling interview questions

15 real Error Handling questions from the Go bank, as asked in Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd — free to start.

1. What is error interface?

Junior
  1. A.the built-in single-method contract with an Error returning string that idiomatic functions return as a final value
  2. B.the helper that reports whether any error in a wrapped chain matches a specific sentinel target
  3. C.attaching context to a returned failure using the %w verb in fmt.Errorf so the original can be unwrapped later
  4. D.the builtin that stops normal flow, runs deferred calls up the stack, and crashes the program if not recovered
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3. Which statement is correct?

Junior
  1. A.error interface — the helper that reports whether any error in a wrapped chain matches a specific sentinel target
  2. B.error interface — the built-in single-method contract with an Error returning string that idiomatic functions return as a final value
  3. C.error interface — attaching context to a returned failure using the %w verb in fmt.Errorf so the original can be unwrapped later
  4. D.error interface — the builtin, valid only inside a deferred function, that stops a panicking sequence and resumes normal execution
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4. What is Error wrapping?

Mid
  1. A.the built-in single-method contract with an Error returning string that idiomatic functions return as a final value
  2. B.the helper that reports whether any error in a wrapped chain matches a specific sentinel target
  3. C.the builtin, valid only inside a deferred function, that stops a panicking sequence and resumes normal execution
  4. D.attaching context to a returned failure using the %w verb in fmt.Errorf so the original can be unwrapped later
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6. Which statement is correct?

Mid
  1. A.Error wrapping — the built-in single-method contract with an Error returning string that idiomatic functions return as a final value
  2. B.Error wrapping — the builtin that stops normal flow, runs deferred calls up the stack, and crashes the program if not recovered
  3. C.Error wrapping — the helper that reports whether any error in a wrapped chain matches a specific sentinel target
  4. D.Error wrapping — attaching context to a returned failure using the %w verb in fmt.Errorf so the original can be unwrapped later
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7. What is errors.Is?

Mid
  1. A.the builtin that stops normal flow, runs deferred calls up the stack, and crashes the program if not recovered
  2. B.attaching context to a returned failure using the %w verb in fmt.Errorf so the original can be unwrapped later
  3. C.the helper that reports whether any error in a wrapped chain matches a specific sentinel target
  4. D.the builtin, valid only inside a deferred function, that stops a panicking sequence and resumes normal execution
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9. Which statement is correct?

Mid
  1. A.errors.Is — attaching context to a returned failure using the %w verb in fmt.Errorf so the original can be unwrapped later
  2. B.errors.Is — the helper that reports whether any error in a wrapped chain matches a specific sentinel target
  3. C.errors.Is — the builtin, valid only inside a deferred function, that stops a panicking sequence and resumes normal execution
  4. D.errors.Is — the builtin that stops normal flow, runs deferred calls up the stack, and crashes the program if not recovered
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10. What is panic?

Mid
  1. A.the builtin, valid only inside a deferred function, that stops a panicking sequence and resumes normal execution
  2. B.the builtin that stops normal flow, runs deferred calls up the stack, and crashes the program if not recovered
  3. C.attaching context to a returned failure using the %w verb in fmt.Errorf so the original can be unwrapped later
  4. D.the helper that reports whether any error in a wrapped chain matches a specific sentinel target
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12. Which statement is correct?

Mid
  1. A.panic — the helper that reports whether any error in a wrapped chain matches a specific sentinel target
  2. B.panic — the builtin that stops normal flow, runs deferred calls up the stack, and crashes the program if not recovered
  3. C.panic — the built-in single-method contract with an Error returning string that idiomatic functions return as a final value
  4. D.panic — the builtin, valid only inside a deferred function, that stops a panicking sequence and resumes normal execution
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13. What is recover?

Senior
  1. A.the builtin, valid only inside a deferred function, that stops a panicking sequence and resumes normal execution
  2. B.the builtin that stops normal flow, runs deferred calls up the stack, and crashes the program if not recovered
  3. C.the built-in single-method contract with an Error returning string that idiomatic functions return as a final value
  4. D.attaching context to a returned failure using the %w verb in fmt.Errorf so the original can be unwrapped later
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15. Which statement is correct?

Senior
  1. A.recover — the builtin that stops normal flow, runs deferred calls up the stack, and crashes the program if not recovered
  2. B.recover — attaching context to a returned failure using the %w verb in fmt.Errorf so the original can be unwrapped later
  3. C.recover — the helper that reports whether any error in a wrapped chain matches a specific sentinel target
  4. D.recover — the builtin, valid only inside a deferred function, that stops a panicking sequence and resumes normal execution
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More Go topics

Core Language (15)Types & Structs (15)Interfaces (15)Goroutines & Concurrency (15)Channels (15)Memory & Performance (15)Generics (15)Standard Library & Idioms (15)Packages & Tooling (15)