call: Wasm-Textinstruktion

(module
  ;; Import the `greet` function from the environment
  (import "env" "greet" (func $greet))

  (func (export "greet")
    ;; Call the imported `greet` function
    call $greet
  )

  ;; Calculate the factorial of a number
  (func $fac (export "fac") (param $x i64) (result i64)
    ;; Call the `fac-aux` function with $x and 1 parameters
    (return_call $fac-aux (local.get $x) (i64.const 1))
  )

  ;; Perform the factorial calculation
  (func $fac-aux (param $x i64) (param $r i64) (result i64)
    ;; If $x is zero, return the accumulated result $r
    (if (result i64) (i64.eqz (local.get $x))
      (then (return (local.get $r)))
      (else
        ;; Otherwise, recursively call `fac-aux` with $x-1 and $x*$r
        (return_call $fac-aux
          (i64.sub (local.get $x) (i64.const 1))
          (i64.mul (local.get $x) (local.get $r))
        )
      )
    )
  )
)

const url = "{%wasm-url%}";
const { instance } = await WebAssembly.instantiateStreaming(fetch(url), {
  env: {
    greet() {
      console.log("Hello");
    },
  },
});

instance.exports.greet();
// Expected output: "Hello"

console.log(instance.exports.fac(5n));
// Expected output: 120n

call $greet