I have a another noob question about loop. Since elixir is immutable, while loop is not directly possible. total = 10 while total != 0 puts "hello" total -= 1 end The question and answer in this example use list for loop. Convert ruby while loop into elixir

[image] peerreynders: Going down to assembly language a loop often has a test, conditional jump, body and unconditional jump - which really is iterative. LLVM has that as well except you can only reference bindings defined before, and bindings are immutable, so you have to allocate memory som…

[image] Zesky665: Correct me if I’m wrong (It’s been a few years since my last comp sci course) but aren’t while loops in most languages just synaptic sugar for recursive functions. By which I mean that they compile down to the same code and aren’t functionally much different. Regardless of w…

[image] Zesky665: Correct me if I’m wrong (It’s been a few years since my last comp sci course) but aren’t while loops in most languages just synaptic sugar for recursive functions. By which I mean that they compile down to the same code and aren’t functionally much different. The major diffe…

[image] mgwidmann: …in every other language… In some other languages–you might be surprised how few. For starters, basically all functional languages have tail call optimization (without explicit looping constructs built in they have to), and that includes the JVM-based ones like Scala & Clos…

[image] sribe: JVM-based ones like Scala & Clojure The JVM itself doesn’t TCO - so it’s up to the language to fake it. Clojure in particular has recur to support iteration - it essentially replaces the data in a “recursion frame” before reentering the body of a loop; it’s an iterative loop b…

Yep, that’s why Java wasn’t on my list :wink:

Ultimately it depends on how determined you are: Functional Programming in Java (Pragprog) p.123 - Chapter 7: Optimizing Recursions - Turning to Tail Recursion https://media.pragprog.com/titles/vsjava8/code/recur/fpij/Factorial.java https://media.pragprog.com/titles/vsjava8/code/recur/fpij/TailC…

[image] mgwidmann: The major difference (from the developer’s point of view) between a while loop and a recursive function is that in every other language a recursive function allocates a new stack frame and therefore has a limit to how many times it can be recursively executed. Mmm, no? A l…

def interest_calculator(interest, amount, no_of_days) do interest_per_day = ((interest/100)/30) |> Float.floor(4) amount_interest_per_day = interest_per_day * amount total_balance = amount_interest_per_day + amount case no_of_days > 0 do true -> calculator(interest, total_bal…

[image] sribe: In actual apps, you want to iterate over some collection of data items. The for or while loop is how you do that in an imperative language In real life I can use while(some_condition) for repeating an action unknown number of times. Like: do { name = generate_new_name(); } w…

Elixir Programming Language Forum

Write while loop equivalent in elixir

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sribe August 17, 2018, 1:35pm 20

Yep, that’s why Java wasn’t on my list