Laziness interview questions

15 real Laziness questions from the Functional Programming 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 Lazy evaluation?

Mid
  1. A.a strategy that delays computing an expression until its value is actually needed
  2. B.caching the result of a deferred or pure computation so repeated demands return the stored value without recomputing
  3. C.a strategy that computes an expression immediately when it is bound, regardless of whether the result is used
  4. D.a conceptually endless stream of values that can be defined and consumed piece by piece only because computation is deferred
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3. Which statement is correct?

Mid
  1. A.Lazy evaluation — caching the result of a deferred or pure computation so repeated demands return the stored value without recomputing
  2. B.Lazy evaluation — a conceptually endless stream of values that can be defined and consumed piece by piece only because computation is deferred
  3. C.Lazy evaluation — a deferred computation wrapped as a zero-argument routine whose result is computed on first demand
  4. D.Lazy evaluation — a strategy that delays computing an expression until its value is actually needed
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4. What is Eager evaluation?

Mid
  1. A.a strategy that delays computing an expression until its value is actually needed
  2. B.a conceptually endless stream of values that can be defined and consumed piece by piece only because computation is deferred
  3. C.a deferred computation wrapped as a zero-argument routine whose result is computed on first demand
  4. D.a strategy that computes an expression immediately when it is bound, regardless of whether the result is used
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6. Which statement is correct?

Mid
  1. A.Eager evaluation — a strategy that computes an expression immediately when it is bound, regardless of whether the result is used
  2. B.Eager evaluation — a strategy that delays computing an expression until its value is actually needed
  3. C.Eager evaluation — caching the result of a deferred or pure computation so repeated demands return the stored value without recomputing
  4. D.Eager evaluation — a deferred computation wrapped as a zero-argument routine whose result is computed on first demand
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7. What is Infinite sequence?

Senior
  1. A.a deferred computation wrapped as a zero-argument routine whose result is computed on first demand
  2. B.caching the result of a deferred or pure computation so repeated demands return the stored value without recomputing
  3. C.a strategy that computes an expression immediately when it is bound, regardless of whether the result is used
  4. D.a conceptually endless stream of values that can be defined and consumed piece by piece only because computation is deferred
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8. Which term means: "a conceptually endless stream of values that can be defined and consumed piece by piece only because computation is deferred"?

Senior
  1. A.Lazy evaluation
  2. B.Infinite sequence
  3. C.Thunk
  4. D.Eager evaluation
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9. Which statement is correct?

Senior
  1. A.Infinite sequence — caching the result of a deferred or pure computation so repeated demands return the stored value without recomputing
  2. B.Infinite sequence — a strategy that delays computing an expression until its value is actually needed
  3. C.Infinite sequence — a conceptually endless stream of values that can be defined and consumed piece by piece only because computation is deferred
  4. D.Infinite sequence — a deferred computation wrapped as a zero-argument routine whose result is computed on first demand
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10. What is Thunk?

Senior
  1. A.caching the result of a deferred or pure computation so repeated demands return the stored value without recomputing
  2. B.a strategy that delays computing an expression until its value is actually needed
  3. C.a deferred computation wrapped as a zero-argument routine whose result is computed on first demand
  4. D.a strategy that computes an expression immediately when it is bound, regardless of whether the result is used
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12. Which statement is correct?

Senior
  1. A.Thunk — a deferred computation wrapped as a zero-argument routine whose result is computed on first demand
  2. B.Thunk — a strategy that computes an expression immediately when it is bound, regardless of whether the result is used
  3. C.Thunk — a strategy that delays computing an expression until its value is actually needed
  4. D.Thunk — a conceptually endless stream of values that can be defined and consumed piece by piece only because computation is deferred
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13. What is Memoization?

Senior
  1. A.caching the result of a deferred or pure computation so repeated demands return the stored value without recomputing
  2. B.a deferred computation wrapped as a zero-argument routine whose result is computed on first demand
  3. C.a conceptually endless stream of values that can be defined and consumed piece by piece only because computation is deferred
  4. D.a strategy that computes an expression immediately when it is bound, regardless of whether the result is used
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14. Which term means: "caching the result of a deferred or pure computation so repeated demands return the stored value without recomputing"?

Senior
  1. A.Eager evaluation
  2. B.Memoization
  3. C.Infinite sequence
  4. D.Lazy evaluation
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15. Which statement is correct?

Senior
  1. A.Memoization — caching the result of a deferred or pure computation so repeated demands return the stored value without recomputing
  2. B.Memoization — a conceptually endless stream of values that can be defined and consumed piece by piece only because computation is deferred
  3. C.Memoization — a strategy that delays computing an expression until its value is actually needed
  4. D.Memoization — a strategy that computes an expression immediately when it is bound, regardless of whether the result is used
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