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flatMap

_.flatMap(iteratee, collection) # Ⓢ [Ⓣ][1] Ⓝ

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​

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

Returns​

(Array): Returns the new flattened array.

Example​

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

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