.flatMap(collection, [iteratee=.identity])

sourcenpm package

Creates a flattened array of values by running each element in collection thru iteratee and flattening the mapped results. The iteratee is invoked with three arguments: (value, index|key, collection).

Since

4.0.0

Arguments

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

Returns

(Array): Returns the new flattened array.

Example

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