Hey, Devs!
Do you know what an arity of a function is?
In math, the arity of a function represents the number of arguments of a function.
On programming is not different, an arity is also the representation of the number of its positional params.
When we have a function:
With No arguments, we say it has the arity 0 and can be called a Nullary function.
With only 1 argument, we say it has the arity 1 and can be called a Unary Function.
With 2 arguments, we say it has the arity 2 and can be called a Binary function.
With 3 arguments, we say it has the arity 3 and can be called a Ternary function.
With more than 3 arguments, now we can be called according to the quantity of the arguments post-fixed with
ary.
Eg.:4-ary,5-ary,6-ary.
Let's code with Elixir...
defmodule Example do
def say(), do: "Hey I am here!"
def say(name), do: "Hey #{name}, I am here!"
def say(first_name, last_name), do: "Hey #{first_name} #{last_name}, I am here!"
end
The arity can be represented like that: function/number of arity
Eg.: When we executed the function Example.say/0
Example.say()
--> "Hey I am here!"
# Arity: say/0
# -------------------
Eg.: When we executed the function Example.say/1
Example.say("Diego")
--> "Hey Diego, I am here!"
# Arity: say/1
# -------------------
Eg.: When we executed the function Example.say/2
Example.say("Diego", "Novais")
--> "Hey Diego Novais, I am here!"
# Arity: say/2
I hope that makes sense to you! And see you in the next content.
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