Enum.with_index
You're seeing just the function
with_index
, go back to Enum module for more information.
Specs
with_index(t(), integer()) :: [{term(), integer()}]
with_index(t(), (element(), index() -> value)) :: [value] when value: any()
Returns the enumerable
with each element wrapped in a tuple
alongside its index.
May receive a function or an integer offset.
If an offset
is given, it will index from the given offset instead of from
zero.
If a function
is given, it will index by invoking the function for each
element and index (zero-based) of the enumerable.
Examples
iex> Enum.with_index([:a, :b, :c])
[a: 0, b: 1, c: 2]
iex> Enum.with_index([:a, :b, :c], 3)
[a: 3, b: 4, c: 5]
iex> Enum.with_index([:a, :b, :c], fn element, index -> {index, element} end)
[{0, :a}, {1, :b}, {2, :c}]