Code Snippet for Interview

Prefer concise code

• less code, faster to write,
• reduce the chance to make mistake
  
  

Array to set

Arrays.stream(wrapperArray).collect(Collectors.toSet())
Arrays.stream(primitiveArray).boxed().collect(Collectors.toSet())

count.put(word, count.getOrDefault(word, 0) + 1);

Map<String, Long> counted = list.stream()
  .collect(Collectors.groupingBy(Function.identity(), Collectors.counting()));

Map<Character, Long>  astring.chars().mapToObj(ch -> (char) ch)
  .collect(Collectors.groupingBy(Function.identity(), Collectors.counting()));

char[] to Stream

Stream<Character> stream = CharBuffer.wrap(list).chars().mapToObj(ch -> (char)ch);

Stream.of(int1, int2, ...).min(Integer::compare).get();

Character.isLetter/isWhitespace

Arrays.toString(array)

https://leetcode.com/problems/expressive-words/solution/

for (int i = 0; i < N; ++i) {
    if (i == N-1 || ca[i] != ca[i+1]) {//\\ 
        sb.append(ca[i]);
        counts.add(i - prev);
        prev = i;
    }
}