Specs

all?(t(as_boolean(val))) :: boolean() when val: value()

Returns true if all elements in enumerable are truthy.

When an element has a falsy value (false or nil) iteration stops immediately and false is returned. In all other cases true is returned.

Examples

iex> A.Enum.all?([1, 2, 3])
true

iex> A.Enum.all?([1, nil, 3])
false

iex> A.Enum.all?([])
true

Specs

all?(t(val), (val -> as_boolean(term()))) :: boolean() when val: value()

Returns true if fun.(element) is truthy for all elements in enumerable.

Iterates over enumerable and invokes fun on each element. If fun ever returns a falsy value (false or nil), iteration stops immediately and false is returned. Otherwise, true is returned.

Examples

iex> A.Enum.all?([2, 4, 6], fn x -> rem(x, 2) == 0 end)
true

iex> A.Enum.all?([2, 3, 4], fn x -> rem(x, 2) == 0 end)
false

iex> A.Enum.all?([], fn _ -> nil end)
true

Specs

any?(t(as_boolean(val))) :: boolean() when val: value()

Returns true if at least one element in enumerable is truthy.

When an element has a truthy value (neither false nor nil) iteration stops immediately and true is returned. In all other cases false is returned.

Examples

iex> A.Enum.any?([false, false, false])
false

iex> A.Enum.any?([false, true, false])
true

iex> A.Enum.any?([])
false

Specs

any?(t(val), (val -> as_boolean(term()))) :: boolean() when val: value()

Returns true if fun.(element) is truthy for at least one element in enumerable.

Iterates over the enumerable and invokes fun on each element. When an invocation of fun returns a truthy value (neither false nor nil) iteration stops immediately and true is returned. In all other cases false is returned.

Examples

iex> A.Enum.any?([2, 4, 6], fn x -> rem(x, 2) == 1 end)
false

iex> A.Enum.any?([2, 3, 4], fn x -> rem(x, 2) == 1 end)
true

iex> A.Enum.any?([], fn x -> x > 0 end)
false

Specs

at(t(val), integer(), default) :: val | default
when val: value(), default: any()

Finds the element at the given index (zero-based).

Mirrors Enum.at/3 with higher performance for Aja structures.

Specs

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

Concatenates the enumerable on the right with the enumerable on the left.

Mirrors Enum.concat/2 with higher performance for Aja structures.

Specs

count(t(any())) :: non_neg_integer()

Returns the size of the enumerable.

Mirrors Enum.count/1 with higher performance for Aja structures.

Specs

count(t(val), (val -> as_boolean(term()))) :: non_neg_integer()
when val: value()

Returns the count of elements in the enumerable for which fun returns a truthy value.

Mirrors Enum.count/2 with higher performance for Aja structures.

Specs

dedup(t(val)) :: [val] when val: value()

Enumerates the enumerable, returning a list where all consecutive duplicated elements are collapsed to a single element.

Mirrors Enum.dedup/1 with higher performance for Aja structures.

Specs

dedup_by(t(val), (val -> term())) :: [val] when val: value()

Enumerates the enumerable, returning a list where all consecutive duplicated elements are collapsed to a single element.

Mirrors Enum.dedup_by/2 with higher performance for Aja structures.

Specs

drop(t(val), integer()) :: [val] when val: value()

Drops the amount of elements from the enumerable.

Mirrors Enum.drop/2 with higher performance for Aja structures.

Specs

drop_while(t(val), (val -> as_boolean(term()))) :: [val] when val: value()

Drops elements at the beginning of the enumerable while fun returns a truthy value.

Mirrors Enum.drop_while/2 with higher performance for Aja structures.

Specs

each(t(val), (val -> term())) :: :ok when val: value()

Invokes the given fun for each element in the enumerable.

Mirrors Enum.each/2 with higher performance for Aja structures.

Specs

empty?(t(any())) :: boolean()

Returns true if enumerable is empty, otherwise false.

Mirrors Enum.empty?/1 with higher performance for Aja structures.

Specs

fetch(t(val), integer()) :: {:ok, val} | :error when val: value()

Finds the element at the given index (zero-based).

Mirrors Enum.fetch/2 with higher performance for Aja structures.

Specs

fetch!(t(val), integer()) :: val when val: value()

Finds the element at the given index (zero-based).

Mirrors Enum.fetch!/2 with higher performance for Aja structures.

Specs

filter(t(val), (val -> as_boolean(term()))) :: [val] when val: value()

Filters the enumerable, i.e. returns only those elements for which fun returns a truthy value.

Mirrors Enum.filter/2 with higher performance for Aja structures.

Specs

find(t(val), default, (val -> as_boolean(term()))) :: val | default
when val: value(), default: value()

Returns the first element for which fun returns a truthy value. If no such element is found, returns default.

Mirrors Enum.find/3 with higher performance for Aja structures.

Specs

find_index(t(val), (val -> as_boolean(term()))) :: non_neg_integer() | nil
when val: value()

Similar to find/3, but returns the index (zero-based) of the element instead of the element itself.

Mirrors Enum.find_index/2 with higher performance for Aja structures.

Specs

find_value(t(val), default, (val -> new_val)) :: new_val | default
when val: value(), new_val: value(), default: value()

Similar to find/3, but returns the value of the function invocation instead of the element itself.

Mirrors Enum.find_value/3 with higher performance for Aja structures.

Specs

flat_map(t(val), (val -> t(mapped_val))) :: [mapped_val]
when val: value(), mapped_val: value()

Maps the given fun over enumerable and flattens the result.

Mirrors Enum.flat_map/2 with higher performance for Aja structures.

Specs

frequencies(t(val)) :: %{optional(val) => non_neg_integer()} when val: value()

Returns a map with keys as unique elements of enumerable and values as the count of every element.

Mirrors Enum.frequencies/1 with higher performance for Aja structures.

Specs

frequencies_by(t(val), (val -> key)) :: %{optional(key) => non_neg_integer()}
when val: value(), key: any()

Returns a map with keys as unique elements given by key_fun and values as the count of every element.

Mirrors Enum.frequencies_by/2 with higher performance for Aja structures.

Specs

group_by(t(val), (val -> key), (val -> mapped_val)) :: %{
  optional(key) => [mapped_val]
}
when val: value(), key: any(), mapped_val: any()

Splits the enumerable into groups based on key_fun.

Mirrors Enum.group_by/3 with higher performance for Aja structures.

Specs

intersperse(t(val), separator) :: [val | separator]
when val: value(), separator: value()

Intersperses separator between each element of the given enumerable.

Mirrors Enum.intersperse/2 with higher performance for Aja structures.

Specs

into(t(val), Collectable.t()) :: Collectable.t() when val: value()

Inserts the given enumerable into a collectable.

Mirrors Enum.into/2 with higher performance for Aja structures.

Specs

join(t(val), String.t()) :: String.t() when val: String.Chars.t()

Joins the given enumerable into a string using joiner as a separator.

Mirrors Enum.join/2 with higher performance for Aja structures.

Specs

map(t(v1), (v1 -> v2)) :: [v2] when v1: value(), v2: value()

Returns a list where each element is the result of invoking fun on each corresponding element of enumerable.

Mirrors Enum.map/2 with higher performance for Aja structures.

Specs

map_intersperse(t(val), separator, (val -> mapped_val)) :: [
  mapped_val | separator
]
when val: value(), separator: value(), mapped_val: value()

Maps and intersperses the given enumerable in one pass.

Mirrors Enum.map_intersperse/3 with higher performance for Aja structures.

Specs

map_join(t(val), String.t(), (val -> String.Chars.t())) :: String.t()
when val: value()

Maps and joins the given enumerable in one pass.

Mirrors Enum.map_join/3 with higher performance for Aja structures.

Specs

map_reduce(t(val), acc, (val, acc -> {mapped_val, acc})) :: {t(mapped_val), acc}
when val: value(), mapped_val: value(), acc: any()

Invokes the given function to each element in the enumerable to reduce it to a single element, while keeping an accumulator.

Mirrors Enum.map_reduce/3 with higher performance for Aja structures.

Specs

max(t(val), (val, val -> boolean()) | module(), (() -> empty_result)) ::
  val | empty_result
when val: value(), empty_result: any()

Returns the maximal element in the enumerable according to Erlang's term ordering.

Mirrors Enum.max/3 with higher performance for Aja structures.

Specs

max_by(
  t(val),
  (val -> key),
  (key, key -> boolean()) | module(),
  (() -> empty_result)
) :: val | empty_result
when val: value(), key: term(), empty_result: any()

Returns the maximal element in the enumerable as calculated by the given fun.

Mirrors Enum.max_by/4 with higher performance for Aja structures.

Specs

member?(t(val), val) :: boolean() when val: value()

Checks if element exists within the enumerable.

Just an alias for Enum.member?/2, does not improve performance.

Specs

min(t(val), (val, val -> boolean()) | module(), (() -> empty_result)) ::
  val | empty_result
when val: value(), empty_result: any()

Returns the minimal element in the enumerable according to Erlang's term ordering.

Mirrors Enum.min/3 with higher performance for Aja structures.

Specs

min_by(
  t(val),
  (val -> key),
  (key, key -> boolean()) | module(),
  (() -> empty_result)
) :: val | empty_result
when val: value(), key: term(), empty_result: any()

Returns the minimal element in the enumerable as calculated by the given fun.

Mirrors Enum.min_by/4 with higher performance for Aja structures.

Specs

product(t(num)) :: num when num: number()

Returns the product of all elements in the enumerable.

Mirrors Enum.product/1 from Elixir 1.12.

Raises ArithmeticError if enumerable contains a non-numeric value.

Examples

iex> 1..5 |> A.Enum.product()
120
iex> [] |> A.Enum.product()
1

Specs

random(t(val)) :: val when val: value()

Returns a random element of an enumerable.

Mirrors Enum.random/1 with higher performance for Aja structures.

Specs

reduce(t(val), (val, val -> val)) :: val when val: value()

Invokes fun for each element in the enumerable with the accumulator.

Mirrors Enum.reduce/2 with higher performance for Aja structures.

Specs

reduce(t(val), acc, (val, acc -> acc)) :: acc when val: value(), acc: term()

Invokes fun for each element in the enumerable with the accumulator.

Mirrors Enum.reduce/3 with higher performance for Aja structures.

Specs

reject(t(val), (val -> as_boolean(term()))) :: [val] when val: value()

Returns a list of elements in enumerable excluding those for which the function fun returns a truthy value.

Mirrors Enum.reject/2 with higher performance for Aja structures.

Specs

reverse(t(val)) :: [val] when val: value()

Returns a list of elements in enumerable in reverse order.

Mirrors Enum.reverse/1 with higher performance for Aja structures.

Specs

reverse(t(val), t(val)) :: [val] when val: value()

Reverses the elements in enumerable, concatenates the tail, and returns it as a list.

Mirrors Enum.reverse/2 with higher performance for Aja structures.

Specs

scan(t(val), (val, val -> val)) :: val when val: value()

Applies the given function to each element in the enumerable, storing the result in a list and passing it as the accumulator for the next computation. Uses the first element in the enumerable as the starting value.

Mirrors Enum.scan/2 with higher performance for Aja structures.

Specs

scan(t(val), acc, (val, acc -> acc)) :: acc when val: value(), acc: term()

Applies the given function to each element in the enumerable, storing the result in a list and passing it as the accumulator for the next computation. Uses the given acc as the starting value.

Mirrors Enum.scan/3 with higher performance for Aja structures.

Specs

shuffle(t(val)) :: [val] when val: value()

Returns a list with the elements of enumerable shuffled.

Mirrors Enum.shuffle/1 with higher performance for Aja structures.

Specs

slice(t(val), Range.t()) :: [val] when val: value()

Returns a subset list of the given enumerable by index_range.

Mirrors Enum.slice/2 with higher performance for Aja structures.

Specs

slice(t(val), index(), non_neg_integer()) :: [val] when val: value()

Returns a subset list of the given enumerable, from start_index (zero-based) with amount number of elements if available.

Mirrors Enum.slice/3.

Specs

sort(t(val)) :: [val] when val: value()

Sorts the enumerable according to Erlang's term ordering.

Mirrors Enum.sort/1 with higher performance for Aja structures.

Specs

sort(
  t(val),
  (val, val -> boolean()) | :asc | :desc | module() | {:asc | :desc, module()}
) :: [val]
when val: value()

Sorts the enumerable by the given function.

Mirrors Enum.sort/2 with higher performance for Aja structures.

Specs

sort_by(
  t(val),
  (val -> mapped_val),
  (val, val -> boolean()) | :asc | :desc | module() | {:asc | :desc, module()}
) :: [val]
when val: value(), mapped_val: value()

Sorts the mapped results of the enumerable according to the provided sorter function.

Mirrors Enum.sort_by/3 with higher performance for Aja structures.

Specs

split(t(val), integer()) :: {[val], [val]} when val: value()

Splits the enumerable into two enumerables, leaving count elements in the first one.

Mirrors Enum.split/2 with higher performance for Aja structures.

Specs

split_while(t(val), (val -> as_boolean(term()))) :: {[val], [val]}
when val: value()

Splits enumerable in two at the position of the element for which fun returns a falsy value (false or nil) for the first time.

Mirrors Enum.split_while/2 with higher performance for Aja structures.

Specs

split_with(t(val), (val -> as_boolean(term()))) :: {[val], [val]}
when val: value()

Splits the enumerable in two lists according to the given function fun.

Mirrors Enum.split_with/2 with higher performance for Aja structures.

Specs

sum(t(num)) :: num when num: number()

Returns the sum of all elements.

Mirrors Enum.sum/1 with higher performance for Aja structures.

Specs

take(t(val), integer()) :: [val] when val: value()

Takes an amount of elements from the beginning or the end of the enumerable.

Mirrors Enum.take/2 with higher performance for Aja structures.

Specs

take_random(t(val), non_neg_integer()) :: [val] when val: value()

Takes count random elements from enumerable.

Mirrors Enum.take_random/2 with higher performance for Aja structures.

Specs

take_while(t(val), (val -> as_boolean(term()))) :: [val] when val: value()

Takes the elements from the beginning of the enumerable while fun returns a truthy value.

Mirrors Enum.take_while/2 with higher performance for Aja structures.

Specs

to_list(t(val)) :: [val] when val: value()

Converts enumerable to a list.

Mirrors Enum.to_list/1 with higher performance for Aja structures.

Specs

uniq(t(val)) :: [val] when val: value()

Enumerates the enumerable, removing all duplicated elements.

Mirrors Enum.uniq/1 with higher performance for Aja structures.

Specs

uniq_by(t(val), (val -> term())) :: [val] when val: value()

Enumerates the enumerable, by removing the elements for which function fun returned duplicate elements.

Mirrors Enum.uniq_by/2 with higher performance for Aja structures.

Specs

unzip(t({val1, val2})) :: {[val1], [val2]} when val1: value(), val2: value()

Opposite of zip/2. Extracts two-element tuples from the given enumerable and groups them together.

Mirrors Enum.unzip/1 with higher performance for Aja structures.

Specs

with_index(t(val), index()) :: [{val, index()}] when val: value()

with_index(t(val), (val, index() -> mapped_val)) :: [mapped_val]
when val: value(), mapped_val: value()

Returns a list with with each element of enumerable wrapped in a tuple alongside its index.

Mirrors Enum.with_index/2 (Elixir 1.12 version): may receive a function or an integer offset.

If an integer 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> A.Enum.with_index([:a, :b, :c])
[a: 0, b: 1, c: 2]

iex> A.Enum.with_index([:a, :b, :c], 3)
[a: 3, b: 4, c: 5]

iex> A.Enum.with_index([:a, :b, :c], fn element, index -> {index, element} end)
[{0, :a}, {1, :b}, {2, :c}]

Specs

zip(t(val1), t(val2)) :: [{val1, val2}] when val1: value(), val2: value()

Zips corresponding elements from two enumerables into one list of tuples.

Mirrors Enum.zip/2 with higher performance for Aja structures.