Calling a function inside other function

owaisqayum

Hi,

I am having three functions and the data inputs to only one of them. Lets say i have a function A having two parameters a and b. The sum operation is going inside.

def sum(a, b), do: a + b

Then in the second function, I want to add ten to the result of sum(a, b). So i can simply do like

def sum(a, b) do 
a + b
|> add()
end

and then define add.

def add(sum) do
sum + 10
end

Now, my question is that how can I use this sum function and add functions separately. let’s say in a third function I want to take the product of sum and add function. Right now I can’t use them as the sum function is always calling the add function.

def product() do
# code here
add * sum
end

16 comments

#book-programming-elixir #deployment #troubleshooting #learning-elixir

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2020-10-20 07:28:53 UTC

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LostKobrakai

Are you looking for this one?

Post #1

owaisqayum

Actually no, I am looking for something where I can use the output of a function and also use it in some other function without specifying the arguments.

Post #2

LostKobrakai

That sounds like OOP. Elixir doesn’t have objects. Functions act on their parameters (besides side-effects).

Post #3

owaisqayum

yeah, you are right … is there any approach that I can follow to get what I want …
do you think function arity can be my friend

Post #4

LostKobrakai

I still don’t really understand what you’re after, so I can’t really give suggestions for alternatives.

Post #5

owaisqayum

I want to use the output of a function A in let says function B. Sometimes we don’t have those parameters in function B, then how can we use the function A output in function B.

There is one way we can call function B in Function A, like this

def A(a, b, c) do
a+ b + c 
|> B()
end

But I don’t want this approach. I want to handle them separately. How you got my question.
Thanks

Post #6

Jcambass

I want to use the output of a function A in let says function B. Sometimes we don’t have those parameters in function B, then how can we use the function A output in function B.

You can’t. If you need the output of function A you either need to call it and pass the output of it as an parameter to function B, or you need to call function A with arguments in function B.

Your question is quite theoretical, maybe you can share the problem you’re actually trying to solve (if you have a concrete thing you’re trying to achieve). Functional is a different way of programming but it can solve the same problems as OOP, it just needs a different way of thinking about the problem you want to solve.

Post #7

owaisqayum

Hi,

thanks for your feedback.

def delta_link(tuple, count) do
    # [{tuple, count}]

    linkv(tuple, count)
  end

  def linkv(tuple, count) do
    try do
      :ets.new(:linkv, [:named_table, :duplicate_bag])
    rescue
      ArgumentError -> :ok
    end

    :ets.insert(:linkv, [{tuple, count} | link()])

    :ets.tab2list(:linkv)
    |> Count.count()
    |> IO.inspect()
  end

  def insert(s, d) do
    dl = :ets.new(:delta_link, [:duplicate_bag])

    :ets.insert(dl, {s, d})

    :ets.lookup(dl, s)
    |> delta_link(1)
  end

in this code, i want to use delta_link separately and linkv separately. I just want to call the output of delta_link in linkv.

Post #8