Generate tail call opcode

C# compiler does not give you any guarantees about tail-call optimizations because C# programs usually use loops and so they do not rely on the tail-call optimizations. So, in C#, this is simply a JIT optimization that may or may not happen (and you cannot rely on it). F# compiler is designed to handle functional … Read more

Explanation of a Prolog algorithm to append two lists together

First, let’s translate the clauses into something more understandable: append([], List, List) :- !. can be written append([], List2, Result) :- Result = List2, !. and append([H|L1], List2, [H|L3]) :- append(L1, List2, L3). can be written append(List1, List2, Result) :- List1 = [Head1 | Tail1], Result = [HeadR | TailR], Head1 = HeadR, append(Tail1, List2, … Read more

F# Tail Recursive Function Example

Start with a simple task, like mapping items from ‘a to ‘b in a list. We want to write a function which has the signature val map: (‘a -> ‘b) -> ‘a list -> ‘b list Where map (fun x -> x * 2) [1;2;3;4;5] == [2;4;6;8;10] Start with non-tail recursive version: let rec map … Read more

Are any JavaScript engines tail call (TCO) optimized?

The ECMAScript 4 specification was originally going to add support for TCO, but it was dropped: No more tail calls in JavaScript? As far as I know, no widely-available implementations of JavaScript currently do automatic TCO. This may be of use to you, though: Tail Call Optimization Essentially, using the accumulator pattern accomplish the same … Read more