_.flatConcat

Concatenates an item to an array of a given position

_.flatConcat(position, item, array)

Parameters:

• position [number]: the position where the item will be added

• item [any] : the item to be added

• array [array]: the array with the elements

Example:

_.flatConcat([1,2,4,5], 2, 3)
// => [1,2,3,4,5]