Hey everyone, I am new to Elixir language and I am having some issues while writing a piece of code. What I am given is a 2D array like list1 = [ [1 ,2,3,4,"nil"], [6,7,8,9,10,], [11,"nil",13,"nil",15], [16,17,"nil",19,20] ] Now, what I’ve to do is to g…

In your specific example, it is better to use Enum.reduce .

Hello and welcome, The code You try to write is not going to work in FP, for many reasons… mostly because data is immutable, and scope is strict. What is defined in a do end block will disappear when the block end. [image] Anshul-13J: a 2D array like It’s not an array, it’s a list of list, …

Gave it a try but still not working! iex(12)> Enum.each(list1, fn row -> ...(12)> Enum.reduce(row, fn x, final_list -> final_list = [final_list | x] end) ...(12)> end ...(12)> ) warning: variable "final_list" is unused (there is a variable with the same …

Thanks for your valuable reply, looks like I gotta lot to learn! Trying to implement it again :smiling_face_with_tear:

Tried this too: iex(14)> Enum.each(list1, fn row -> ...(14)> final_list = row ...(14)> |> Enum.reduce([], fn el,acc -> ...(14)> if el >= 10 and el <= 99 do [el|acc] else acc end ...(14)> en…

You might often realize that You could solve something like this with only one command. This would be my solution. final_list = Enum.reduce(row, [], fn el, acc when el >= 10 and el <= 99 -> [el | acc] _, acc -> acc end) You can see that You don’t need to initially set something to , You can…

From your initial question I think you are missing a key difference between Python and Elixir. Elixir variables are immutable and you cannot modify them like you would in Python. results = [] # <= create empty array for x in range(1, 100): if 10 <= x <= 20: results.append(x) # <= append to th…

Banging your head against the wall is a slow way to learn, dude. Trust me I know, I’ve done the same way too many times. You have to assign the result of almost every function to a variable in Elixir because it does NOT change a variable in place like in Python in many others; it returns a modified…

Really helpful one! The thing is, I am understanding the code, but having issues in writing it! The syntax is a bit changed from languages like Cpp and Python, but I guess I’ll get there. Just need some practice!

Elixir Programming Language Forum

Itertating a 2D matrix

Questions & Help Questions

arcyfelix October 9, 2022, 9:31pm 13

Even in Python, this should have been using reduce().