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:

• WithNo arguments, we say it has the arity 0 and can be called aNullary function.

• With only1 argument, we say it has the arity 1 and can be called aUnary Function.

• With2 arguments, we say it has the arity 2 and can be called aBinary function.

• With3 arguments, we say it has the arity 3 and can be called aTernary function.

• Withmore than 3 arguments, now we can be called according to the quantity of the arguments post-fixed withary.
  Eg.:4-ary,5-ary,6-ary.

Let's code with Elixir...

defmoduleExampledodefsay(),do:"Hey I am here!"defsay(name),do:"Hey#{name}, I am here!"defsay(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 functionExample.say/0

Example.say()-->"Hey I am here!"# Arity: say/0# -------------------

Eg.: When we executed the functionExample.say/1

Example.say("Diego")-->"Hey Diego, I am here!"# Arity: say/1# -------------------

Eg.: When we executed the functionExample.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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