_.flatMapDeep

_.flatMapDeep(collection, [iteratee=_.identity])

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

Since

4.7.0

Arguments

1. collection (Array|Object): The collection to iterate over.
2. [iteratee=_.identity] (Function): The function invoked per iteration.

Returns

(Array): Returns the new flattened array.

Example

function duplicate(n) {
  return [[[n, n]]];
}
 
_.flatMapDeep([1, 2], duplicate);
// => [1, 1, 2, 2]