robertknight
diff --git a/‎__tests__/IndexedSequence.ts
Lines changed: 12 additions & 0 deletions b/‎__tests__/IndexedSequence.ts
Lines changed: 12 additions & 0 deletions
diff --git a/‎dist/Immutable.js
Lines changed: 11 additions & 3 deletions b/‎dist/Immutable.js
Lines changed: 11 additions & 3 deletions
@@ -24,4 +24,16 @@ describe('IndexedSequence', () => {
     expect(operated.first()).toEqual('B');
   });
 
+  it('reverses correctly', () => {
+    var seq = Immutable.Sequence.from(['A', 'B', 'C', 'D', 'E']);
+
+    // This is what we expect for IndexedSequences
+    var operated = seq.reverse();
+    expect(operated.get(0)).toEqual('E');
+    expect(operated.get(1)).toEqual('D');
+    expect(operated.get(4)).toEqual('A');
+
+    expect(operated.first()).toEqual('E');
+    expect(operated.last()).toEqual('A');
+  });
 });
@@ -1171,6 +1171,7 @@ function mapFactory(sequence, mapper, context) {
   return mappedSequence;
 }
 function reverseFactory(sequence) {
+  var isIndexedSequence = (sequence instanceof IndexedSequence);
   var reversedSequence = sequence.__makeSequence();
   reversedSequence.length = sequence.length;
   reversedSequence.reverse = (function() {
@@ -1183,9 +1184,16 @@ function reverseFactory(sequence) {
     });
     return flipSequence;
   };
-  reversedSequence.get = (function(key, notSetValue) {
-    return sequence.get(key, notSetValue);
-  });
+  if (isIndexedSequence) {
+    var reverseIndexOffset = sequence.length - 1;
+    reversedSequence.get = (function(key, notSetValue) {
+      return sequence.get(reverseIndexOffset - key, notSetValue);
+    });
+  } else {
+    reversedSequence.get = (function(key, notSetValue) {
+      return sequence.get(key, notSetValue);
+    });
+  }
   reversedSequence.has = (function(key) {
     return sequence.has(key);
   });