[New] add enumerable properties to Function inspect result, per node’s assert

Author: ljharb

index.js

@@ -106,7 +106,8 @@ module.exports = function inspect_(obj, options, depth, seen) {
 
     if (typeof obj === 'function') {
         var name = nameOf(obj);
-        return '[Function' + (name ? ': ' + name : ' (anonymous)') + ']';
+        var keys = arrObjKeys(obj, inspect);
+        return '[Function' + (name ? ': ' + name : ' (anonymous)') + ']' + (keys.length > 0 ? ' { ' + keys.join(', ') + ' }' : '');
     }
     if (isSymbol(obj)) {
         var symString = symToString.call(obj);

test/fn.js

@@ -12,9 +12,9 @@ test('function name', function (t) {
     var f = (function () {
         return function () {};
     }());
-    f.toString = function () { return 'function xxx () {}'; };
+    f.toString = function toStr() { return 'function xxx () {}'; };
     var obj = [1, 2, f, 4];
-    t.equal(inspect(obj), '[ 1, 2, [Function (anonymous)], 4 ]');
+    t.equal(inspect(obj), '[ 1, 2, [Function (anonymous)] { toString: [Function: toStr] }, 4 ]');
 });
 
 test('anon function', function (t) {