List.insert_at

You're seeing just the function insert_at, go back to List module for more information.

insert_at(list, index, value)

Specs

insert_at(list(), integer(), any()) :: list()

Returns a list with value inserted at the specified index.

Note that index is capped at the list length. Negative indices indicate an offset from the end of the list.

Examples

iex> List.insert_at([1, 2, 3, 4], 2, 0)
[1, 2, 0, 3, 4]

iex> List.insert_at([1, 2, 3], 10, 0)
[1, 2, 3, 0]

iex> List.insert_at([1, 2, 3], -1, 0)
[1, 2, 3, 0]

iex> List.insert_at([1, 2, 3], -10, 0)
[0, 1, 2, 3]