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backend/node_modules/mnemonist/fixed-deque.js

@@ -48,7 +48,10 @@ FixedDeque.prototype.push = function(item) {
   if (this.size === this.capacity)
     throw new Error('mnemonist/fixed-deque.push: deque capacity (' + this.capacity + ') exceeded!');
 
-  var index = (this.start + this.size) % this.capacity;
+  var index = this.start + this.size;
+
+  if (index >= this.capacity)
+    index -= this.capacity;
 
   this.items[index] = item;
 
@@ -85,10 +88,13 @@ FixedDeque.prototype.pop = function() {
   if (this.size === 0)
     return;
 
-  const index = (this.start + this.size - 1) % this.capacity;
-
   this.size--;
 
+  var index = this.start + this.size;
+
+  if (index >= this.capacity)
+    index -= this.capacity;
+
   return this.items[index];
 };
 
@@ -135,7 +141,7 @@ FixedDeque.prototype.peekLast = function() {
 
   var index = this.start + this.size - 1;
 
-  if (index > this.capacity)
+  if (index >= this.capacity)
     index -= this.capacity;
 
   return this.items[index];
@@ -148,12 +154,12 @@ FixedDeque.prototype.peekLast = function() {
  * @return {any}
  */
 FixedDeque.prototype.get = function(index) {
-  if (this.size === 0)
+  if (this.size === 0 || index >= this.capacity)
     return;
 
   index = this.start + index;
 
-  if (index > this.capacity)
+  if (index >= this.capacity)
     index -= this.capacity;
 
   return this.items[index];