Java Interview Questions · interview question
Which statement about map, flatMap, and reduce is the strongest interview answer?
Multiple choiceEasyjava-interview-2026interviewjavastatement
Answer and explanation
Correct answer
D. Map transforms each element, flatMap transforms and flattens nested results, and reduce combines many values into one.
Why
map transforms each element, flatMap transforms and flattens nested results, and reduce combines many values into one. This is the base concept interviewers commonly test first.
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