update: min stack class added

Author: ashokdey

src/_DataStructures_/Stack/baseball-game/index.js

@@ -26,7 +26,8 @@ function sumOfPoints(arr) {
     throw new Error('Invalid Argument!');
   }
   // Track the value of `sum` accordingly
-  for (let el of arr) {
+  // eslint-disable-next-line no-restricted-syntax
+  for (const el of arr) {
     // console.log('data : ', pointsTracker.data);
     // console.log('sum : ', sum);
 
@@ -52,8 +53,8 @@ function sumOfPoints(arr) {
       pointsTracker.push(result);
     } else {
       // push to the Stack if the value is integer
-      sum += parseInt(el);
-      pointsTracker.push(parseInt(el));
+      sum += parseInt(el, 10);
+      pointsTracker.push(parseInt(el, 10));
     }
   }
   return sum;

src/_DataStructures_/Stack/min-stack/index.js

@@ -0,0 +1,59 @@
+/**
+  You have to implement the minStack class which will have a min() function.
+  Whenever min() is called, the minimum value of the stack is returned in O(1) time.
+  The element is not popped from the stack, its value is simply returned.
+
+  Keep in mind that the min function should work in O(1) and should not pop
+  the minimum element out of the stack. It simply returns its value.
+ */
+
+const Stack = require('../index');
+
+class MinStack {
+  constructor() {
+    this.main = new Stack();
+    this.minStack = new Stack();
+  }
+
+  push(element) {
+    this.main.push(element);
+
+    if (!this.minStack.peek()) {
+      return this.minStack.push(element);
+    }
+    if (element > this.minStack.peek()) {
+      return this.minStack.push(this.minStack.peek());
+    }
+    return this.minStack.push(element);
+  }
+
+  pop() {
+    this.minStack.pop();
+    return this.main.pop();
+  }
+
+  getMin() {
+    return this.minStack.peek();
+  }
+}
+
+const ms = new MinStack();
+
+ms.push(1);
+ms.push(10);
+ms.push(21);
+ms.push(3);
+ms.push(9);
+ms.push(-11);
+ms.push(32);
+
+// eslint-disable-next-line no-console
+console.log(ms.minStack.data);
+// eslint-disable-next-line no-console
+console.log(ms.getMin());
+
+ms.pop();
+ms.pop();
+
+// eslint-disable-next-line no-console
+console.log(ms.getMin());