Lodash

flatMap

Collection
since 4.0.0

Arguments

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

Returns

Array the new flattened array.

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).

Example of Lodash _.flatMap

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

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