A.Vector.concat

You're seeing just the function concat, go back to A.Vector module for more information.
Link to this function

concat(vector, enumerable)

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Specs

concat(t(val), Enumerable.t()) :: t(val) when val: value()

Appends all values from an enumerable at the end of a vector.

Runs in effective linear time in respect with the length of enumerable, disregarding the size of the vector.

Examples

iex> A.Vector.new(1..5) |> A.Vector.concat(10..15)
vec([1, 2, 3, 4, 5, 10, 11, 12, 13, 14, 15])
iex> A.Vector.new() |> A.Vector.concat(10..15)
vec([10, 11, 12, 13, 14, 15])