How is flatMap() working? - Cracking the Java Coding Interview #javalanguage #javacoding #javatips

A brief explanation of how flatMap() works in Java's Stream API. It is an intermediate operation where the mapping function returns a Stream instead of a plain object, and all resulting streams are flattened into one. flatMap() can be used to concatenate streams and is more efficient than Stream.concat(). An alternative is the mapMulti() method, which avoids creating intermediate streams and can be more efficient in some cases.