Update Stacks.md

ps0305 · web-flow · commit 4a50a20dd0a1 · 2022-04-10T18:17:55.000+05:30
diff --git a/Basic Data Structures/Implementation of Stack in JavaScript/Stacks.md b/Basic Data Structures/Implementation of Stack in JavaScript/Stacks.md
@@ -123,3 +123,7 @@ class Stack {
     return this.reverse ? this.stack.shift() : this.stack.pop();
   }
 }
+
+```
+
+> **As the number of items grows, push/pop becomes increasingly more performant than unshift/shift because every item needs to be reindexed in the latter but not the former.

Original file line number	Diff line number	Diff line change
`@@ -123,3 +123,7 @@ class Stack {`
`123`	`123`	`return this.reverse ? this.stack.shift() : this.stack.pop();`
`124`	`124`	`}`
`125`	`125`	`}`
	`126`	`+`
	`127`	+```
	`128`	`+`
	`129`	`+> **As the number of items grows, push/pop becomes increasingly more performant than unshift/shift because every item needs to be reindexed in the latter but not the former.`