A.List (Aja v0.2.0) View Source
Some extra helper functions for working with lists,
that are not in the core List
module.
Link to this section Summary
Functions
Populates a list of size n
by calling generator_fun
repeatedly.
Link to this section Functions
Populates a list of size n
by calling generator_fun
repeatedly.
Examples
# Although not necessary, let's seed the random algorithm
iex> :rand.seed(:exsplus, {1, 2, 3})
iex> A.List.repeatedly(&:rand.uniform/0, 3)
[0.40502929729990744, 0.45336720247823126, 0.04094511692041057]
# It is basically just syntactic sugar for the following:
iex> Stream.repeatedly(&:rand.uniform/0) |> Enum.take(3)
Rationale
It has a consistent API with
Stream.repeatedly/1
andList.duplicate/2
It provides a less verbose way of writing one of the most common uses of
Stream.repeatedly/1
It removes the temptation to write the following, which is more concise but is technically incorrect:
iex> incorrect = fn n -> for _i <- 1..n, do: :rand.uniform() end iex> incorrect.(0) |> length() 2 # because: iex> Enum.to_list(1..0) [1, 0]
This is the same problem that A.ExRange
is addressing.