In Elixir, is there any way to get a module to list its functions?

elixir
iconoclast picture iconoclast · Feb 22, 2015 · Viewed 16.2k times · Source

In the same way that we can get any object (or class) in Ruby to list its methods, is there any function in Elixir to list all functions belonging to a module? Something (at least remotely) like String.functions (where String could be replaced by any other module name)?

Answer

Steven Schobert picture Steven Schobert · Feb 22, 2015

Each module in Elixir defines an __info__ function you can call to get information about that module.

According the Elixir Docs, 1.6.6 e.g., you can pass it :functions to get a list of functions that module contains.

Map.__info__(:functions)

[delete: 2, drop: 2, equal?: 2, fetch: 2, fetch!: 2, from_struct: 1, get: 2,
 get: 3, has_key?: 2, keys: 1, merge: 2, merge: 3, new: 0, pop: 2, pop: 3,
 put: 3, put_new: 3, size: 1, split: 2, take: 2, to_list: 1, update: 4,
 update!: 3, values: 1]

Related questions

How to join strings in Elixir?

How do I join two strings in a list with a space, like: ["StringA", "StringB"] becomes "StringA StringB"

Read More
How do you check for the type of variable in Elixir

In Elixir how do you check for type such as in Python: >>> a = "test" >>> type(a) <type 'str'> >>> b =10 >>> type(b) <type 'int'> I …

Read More
Convert Elixir string to integer or float

I need to convert a string to a floating point value or an integer. There was no method such as, string_to_integer

Read More