wasm/two-fer: 2nd iteration

wasm/two-fer/coverage/clover.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<coverage generated="1699240284808" clover="3.2.0">
-  <project timestamp="1699240284808" name="All files">
+<coverage generated="1699243322499" clover="3.2.0">
+  <project timestamp="1699243322499" name="All files">
     <metrics statements="0" coveredstatements="0" conditionals="0" coveredconditionals="0" methods="0" coveredmethods="0" elements="0" coveredelements="0" complexity="0" loc="0" ncloc="0" packages="0" files="0" classes="0"/>
   </project>
 </coverage>

wasm/two-fer/coverage/lcov-report/index.html

@@ -86,7 +86,7 @@ <h1>All files</h1>
             <div class='footer quiet pad2 space-top1 center small'>
                 Code coverage generated by
                 <a href="https://istanbul.js.org/" target="_blank" rel="noopener noreferrer">istanbul</a>
-                at 2023-11-06T03:11:24.805Z
+                at 2023-11-06T04:02:02.497Z
             </div>
         <script src="prettify.js"></script>
         <script>

wasm/two-fer/run-tests-wasm.txt

@@ -18,25 +18,25 @@ Node versions:
 
 Running: js-beautify ./babel.config.js ./two-fer.spec.js
 
-beautified babel.config.js
-beautified two-fer.spec.js
+beautified babel.config.js - unchanged
+beautified two-fer.spec.js - unchanged
 
-real	0m0.085s
-user	0m0.082s
-sys	0m0.016s
+real	0m0.086s
+user	0m0.088s
+sys	0m0.010s
 
 
  ==============================================================================
 
 Exit code: 0
 
-real	0m0.387s
-user	0m0.380s
-sys	0m0.071s
+real	0m0.396s
+user	0m0.391s
+sys	0m0.073s
 
-real	0m0.390s
-user	0m0.382s
-sys	0m0.072s
+real	0m0.399s
+user	0m0.394s
+sys	0m0.074s
 
 ===============================================================================
 
@@ -69,49 +69,49 @@ Running: npm run test -- --coverage
 > test
 > node --experimental-vm-modules node_modules/jest/bin/jest.js ./* --coverage
 
-(node:21586) ExperimentalWarning: VM Modules is an experimental feature. This feature could change at any time
+(node:15647) ExperimentalWarning: VM Modules is an experimental feature. This feature could change at any time
 (Use `node --trace-warnings ...` to show where the warning was created)
 PASS ./two-fer.spec.js
   twoFer()
     ✓ no name given (2 ms)
-    ○ skipped a name given
-    ○ skipped another name given
+    ✓ a name given
+    ✓ another name given (1 ms)
 
 ----------|---------|----------|---------|---------|-------------------
 File      | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s 
 ----------|---------|----------|---------|---------|-------------------
 All files |       0 |        0 |       0 |       0 |                   
 ----------|---------|----------|---------|---------|-------------------
 Test Suites: 1 passed, 1 total
-Tests:       2 skipped, 1 passed, 3 total
+Tests:       3 passed, 3 total
 Snapshots:   0 total
-Time:        0.576 s, estimated 1 s
+Time:        0.296 s, estimated 1 s
 Ran all test suites matching /.\/HELP.md|.\/LICENSE|.\/README.md|.\/babel.config.js|.\/node_modules|.\/package-lock.json|.\/package.json|.\/run-tests-wasm.txt|.\/two-fer.spec.js|.\/two-fer.wat/i.
 
-real	0m1.186s
-user	0m1.229s
-sys	0m0.140s
+real	0m0.932s
+user	0m0.958s
+sys	0m0.107s
 
 
  ==============================================================================
 
 Exit code: 0
 
-real	0m1.498s
-user	0m1.522s
-sys	0m0.204s
+real	0m1.265s
+user	0m1.265s
+sys	0m0.168s
 
-real	0m1.501s
-user	0m1.522s
-sys	0m0.206s
+real	0m1.267s
+user	0m1.267s
+sys	0m0.168s
 
 ===============================================================================
 
 Running: misspell ./two-fer.wat
 
-real	0m0.029s
-user	0m0.032s
-sys	0m0.016s
+real	0m0.036s
+user	0m0.035s
+sys	0m0.014s
 
 ===============================================================================
 

wasm/two-fer/two-fer.spec.js

@@ -61,11 +61,11 @@ describe("twoFer()", () => {
         expect(twoFer()).toEqual("One for you, one for me.");
     });
 
-    xtest("a name given", () => {
+    test("a name given", () => {
         expect(twoFer("Alice")).toEqual("One for Alice, one for me.");
     });
 
-    xtest("another name given", () => {
+    test("another name given", () => {
         expect(twoFer("Bob")).toEqual("One for Bob, one for me.");
     });
 });

wasm/two-fer/two-fer.wat

@@ -1,8 +1,36 @@
+;; https://exercism.org/tracks/wasm/exercises/two-fer
+
 (module
   (memory (export "mem") 1)
+
+  ;; default return value/string
+  ;;                   012345678901234567890123
   (data (i32.const 0) "One for you, one for me.")
 
   (func (export "twoFer") (param $offset i32) (param $length i32) (result i32 i32)
-    (return (i32.const 0) (i32.const 24))
+    ;; return the default string when there input is zero-length
+    (if (i32.eqz (local.get $length))
+      (return (i32.const 0) (i32.const 24))
+      )
+
+    ;; copy "One for ", offset 24+8=>32
+    (memory.copy (i32.const 24) (i32.const 0) (i32.const 8))
+
+    ;; copy input string after "One for ", offset 32+$length
+    (memory.copy (i32.const 32) (local.get $offset) (local.get $length))
+
+    ;; copy the end of the default string after the function input
+    (memory.copy
+      ;; new offset =>32+$length
+      (i32.add (i32.const 32) (local.get $length))
+
+      ;; copy ", one for me." to the end off 32+$length
+      (i32.const 11) (i32.const 13)
+      )
+
+    ;; return the new string
+    (return (i32.const 24)
+      (i32.add (i32.const 21) (local.get $length))
+      )
   )
 )