Convenience macro to work with A.ExRanges (exclusive ranges).

Use import A to use it, or import A, only: [~>: 2].

Examples

iex> 1 ~> 5
1 ~> 5
iex> start ~> stop = 0 ~> 10
iex> {start, stop}
{0, 10}
iex> for i <- 0 ~> 5, do: "id_#{i}"
["id_0", "id_1", "id_2", "id_3", "id_4"]

Convenience macro to create or pattern match on A.OrdMaps.

Use import A to use it, or import A, only: [ord: 1].

Creation examples

iex> ord(%{"一" => 1, "二" => 2, "三" => 3})
#A<ord(%{"一" => 1, "二" => 2, "三" => 3})>
iex> ord(%{a: "Ant", b: "Bat", c: "Cat"})
#A<ord(%{a: "Ant", b: "Bat", c: "Cat"})>

Pattern matching examples

iex> ord(%{b: bat}) = ord(%{a: "Ant", b: "Bat", c: "Cat"})
#A<ord(%{a: "Ant", b: "Bat", c: "Cat"})>
iex> bat
"Bat"

Replace existing keys examples

iex> ordered = ord(%{a: "Ant", b: "Bat", c: "Cat"})
iex> ord(%{ordered | b: "Buffalo"})
#A<ord(%{a: "Ant", b: "Buffalo", c: "Cat"})>
iex> ord(%{ordered | z: "Zebra"})
** (KeyError) key :z not found in: #A<ord(%{a: "Ant", b: "Bat", c: "Cat"})>

A sigil to build IO data and avoid string concatenation.

Use import A to use it, or import A, only: [sigil_i: 2].

This sigil provides a faster version of string interpolation which:

• will build a list with all chunks instead of concatenating them as a string
• uses A.IO.to_iodata/1 on interpolated values instead of to_string/1, which:
  • will keep lists untouched, without any validation or transformation
  • will cast anything else using to_string/1

Works with both IO data and Chardata. See their respective documentation for more information.

Examples

iex> ~i"atom: #{:foo}, charlist: #{'abc'}, number: #{12 + 2.35}\n"
["atom: ", "foo", ", charlist: ", 'abc', ", number: ", "14.35", 10]
iex> ~i"abc#{['def' | "ghi"]}"
["abc", ['def' | "ghi"]]
iex> ~i"Giorno Giovanna"
"Giorno Giovanna"

IO data can often be used as is without ever generating the corresponding string. If needed however, IO data can be cast as a string using IO.iodata_to_binary/1, and chardata using List.to_string/1. In most cases, both should be the same:

iex> IO.iodata_to_binary(~i"atom: #{:foo}, charlist: #{'abc'}, number: #{12 + 2.35}\n")
"atom: foo, charlist: abc, number: 14.35\n"
iex> List.to_string(~i"abc#{['def' | "ghi"]}")
"abcdefghi"

Those are the exact same values returned by a regular string interpolation, without the ~i sigil:

iex> "atom: #{:foo}, charlist: #{'abc'}, number: #{12 + 2.35}\n"
"atom: foo, charlist: abc, number: 14.35\n"
iex> "abc#{['def' | "ghi"]}"
"abcdefghi"

Convenience macro to create or pattern match on A.Vectors.

It can only work with known-size vectors.

Examples

iex> import A
iex> vec([1, 2, 3])
#A<vec([1, 2, 3])>
iex> vec([1, 2, var, _, _, _]) = A.Vector.new(1..6)
#A<vec([1, 2, 3, 4, 5, 6])>
iex> var
3
iex> vec([_, _, _]) = A.Vector.new(1..6)
** (MatchError) no match of right hand side value: #A<vec([1, 2, 3, 4, 5, 6])>

It also supports ranges with constant values:

iex> vec(0..4) = A.Vector.new(0..4)
#A<vec([0, 1, 2, 3, 4])>
iex> vec(0~>8)
#A<vec([0, 1, 2, 3, 4, 5, 6, 7])>

Variable lists or dynamic ranges cannot be passed:

vec(my_list)  # invalid
vec(1..n)  # invalid

Explanation

The vec/1 macro generates the AST at compile time instead of building the vector at runtime. This can speedup the instanciation of vectors of known size.

iex> import A
iex> quote do vec([1, foo, _]) end |> Macro.expand(__ENV__) |> Macro.to_string()
"%A.Vector{internal: {3, {1, foo, _, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil}}}"