_.flatMapDepth

_.flatMapDepth(collection, [iteratee=_.identity], [depth=1])

This method is like _.flatMap except that it recursively flattens the mapped results up to depth times.

Since

4.7.0

Arguments

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

Returns

(Array): Returns the new flattened array.

Example

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