Count word frequency in a sentence | Kuchup interview prep

The 30 second answer

I lower-case the text, split on non-word characters, drop blanks, and group with counting. In the interview I clarify tokenization: punctuation, apostrophes, and Unicode letters. Plain W is ASCII-only unless the Unicode character class flag is on.

Map<String, Long> wf = Arrays.stream(text.toLowerCase().split("\\W+"))
    .filter(w -> !w.isBlank())
    .collect(Collectors.groupingBy(Function.identity(), Collectors.counting()));

Clarify tokenization (punctuation, apostrophes, Unicode letters). \W is ASCII-only unless UNICODE_CHARACTER_CLASS is used. Alternative: Pattern.compile("\\W+").splitAsStream(text).

Sources:

Collectors
Pattern

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