fix sparse array inspection (#16204)

fix https://github.com/denoland/deno/issues/16202

2 files changed, 15 insertions, 3 deletions

diff --git a/cli/tests/unit/console_test.ts b/cli/tests/unit/console_test.ts
index 0ab2829fc..2fdb23a40 100644
--- a/cli/tests/unit/console_test.ts
+++ b/cli/tests/unit/console_test.ts
@@ -770,6 +770,16 @@ Deno.test(function consoleTestStringifyIterable() {
     `[ <1 empty item> ]`,
   );
 
+  assertEquals(
+    stringify([, , 1]),
+    `[ <2 empty items>, 1 ]`,
+  );
+
+  assertEquals(
+    stringify([1, , , 1]),
+    `[ 1, <2 empty items>, 1 ]`,
+  );
+
   const withEmptyElAndMoreItems = Array(500);
   withEmptyElAndMoreItems.fill(0, 50, 80);
   withEmptyElAndMoreItems.fill(2, 100, 120);
diff --git a/ext/console/02_console.js b/ext/console/02_console.js
index efb7aeb50..7554a88fc 100644
--- a/ext/console/02_console.js
+++ b/ext/console/02_console.js
@@ -417,6 +417,7 @@
         }
     }
 
+    let entriesLengthWithoutEmptyItems = entriesLength;
     if (options.typeName === "Array") {
       for (
         let i = 0, j = 0;
@@ -433,7 +434,7 @@
 
         if (skipTo) {
           // subtract skipped (empty) items
-          entriesLength -= skipTo - i;
+          entriesLengthWithoutEmptyItems -= skipTo - i;
           i = skipTo;
         }
       }
@@ -478,8 +479,9 @@
       ArrayPrototypeSort(entries);
     }
 
-    if (entriesLength > inspectOptions.iterableLimit) {
-      const nmore = entriesLength - inspectOptions.iterableLimit;
+    if (entriesLengthWithoutEmptyItems > inspectOptions.iterableLimit) {
+      const nmore = entriesLengthWithoutEmptyItems -
+        inspectOptions.iterableLimit;
       ArrayPrototypePush(entries, `... ${nmore} more items`);
     }