I’m really surprised to see Java ranked as less-verbose than OCaml.

Here’s an equivalent code sample in Java 17 vs OCaml:

Java:

abstract sealed class Expr permits Value, Add, Subtract, Multiply, Divide {
  abstract long eval();
}
record Value(long value) extends Expr {
  @Override
  long eval() { return value; }
}
record Add(Expr left, Expr right) {   
  @Override
  long eval() { return left.eval() + right.eval(); }
}
record Subtract(Expr left, Expr right) {
  @Override
  long eval() { return left.eval() - right.eval(); }
}
record Multiply(Expr left, Expr right) {
  @Override
  long eval() { return left.eval() * right.eval(); }
}
record Divide(Expr left, Expr right) {
  @Override
  long eval() { return left.eval() / right.eval(); }
}

OCaml:

type expr = 
  | Value of int
  | Add of expr * expr
  | Subtract of expr * expr
  | Multiply of expr * expr
  | Divide of expr * expr

let rec eval = function 
  | Value value -> value
  | Add (left, right) -> (eval left) + (eval right)
  | Subtract (left, right) -> (eval left) - (eval right)
  | Multiply (left, right) -> (eval left) * (eval right)
  | Divide (left, right) -> (eval left) / (eval right)

…Java has so much more syntactical overhead than OCaml, and that’s even with recent Java and being pretty aggressive about using boiler-plate reducing sugars like Records. And F# has even less, since it doesn’t require you to use different operators for numerics or do as much manual casting between strings/numerics