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live-examples/wat-examples/statements/call.wat

@@ -1,10 +1,12 @@
 (module
+  ;; Import the `greet` function from the environment
   (import "env" "greet" (func $greet))
 
   (func
-    ;; call the greet function
+    ;; Call the imported `greet` function
     call $greet
   )
 
-  (start 1) ;; run the first function automatically
+  ;; Automatically run the first function when the module starts
+  (start 1)
 )

live-examples/wat-examples/statements/return_call.js

@@ -3,3 +3,4 @@ const { instance } = await WebAssembly.instantiateStreaming(fetch(url));
 const result = instance.exports.fac(5n);
 
 console.log(result);
+// Expected output: 120n

live-examples/wat-examples/statements/return_call.wat

@@ -1,12 +1,17 @@
 (module
+  ;; 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))