Lodash

flatMapDeep

Collection
since 4.7.0

Arguments

  • Array|Object The collection to iterate over.
  • Function The function invoked per iteration.

Returns

Array the new flattened array.

This method is like _.flatMap except that it recursively flattens the mapped results.

Example of Lodash _.flatMapDeep

function duplicate(n) {
  return [[[n, n]]];
}

_.flatMapDeep([1, 2], duplicate);
// => [1, 1, 2, 2]