jscript: Fix Array.map when last element doesn't exist.

dlls/jscript/array.c

@@ -1354,14 +1354,16 @@ static HRESULT Array_map(script_ctx_t *ctx, jsval_t vthis, WORD flags, unsigned
     if(argc > 1)
         context_this = argv[1];
 
-    hres = create_array(ctx, length, &array);
+    hres = create_array(ctx, 0, &array);
     if(FAILED(hres))
         goto done;
 
     for(k = 0; k < length; k++) {
         hres = jsdisp_get_idx(jsthis, k, &callback_args[0]);
-        if(hres == DISP_E_UNKNOWNNAME)
+        if(hres == DISP_E_UNKNOWNNAME) {
+            hres = S_OK;
             continue;
+        }
         if(FAILED(hres))
             break;
 

dlls/mshtml/tests/es5.js

@@ -431,6 +431,13 @@ sync_test("array_map", function() {
     [1,2].map(function() {
         ok(this.valueOf() === 137, "this.valueOf() = " + this.valueOf());
     }, 137);
+
+    r = [1,,2,].map(function(x) { return "" + x; });
+    ok(r.length === 3, "[1,,2,].map length = " + r.length);
+    ok(r[0] === "1", "[1,,2,].map[0] = " + r[0]);
+    ok(r[2] === "2", "[1,,2,].map[2] = " + r[2]);
+    ok(!("1" in r), "[1,,2,].map[1] exists");
+    ok(!("3" in r), "[1,,2,].map[3] exists");
 });
 
 sync_test("array_sort", function() {