stack.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Stack</title>
</head>
<body>
    <script>
        let data= [];
        let currentSize =data.length;
        let max=5

        // Though we can add element using push method but it will not remain data stucture so we make a function
        function push(val) {
            if (currentSize>=max) {
                alert('stack value is full you cannot add'+   + val )
            }
           else{
            data[currentSize]=val;
            console.log(data[currentSize]=val);
            currentSize+=1
           }
        }

        function pop() {
            if (currentSize>0) {
                currentSize-=1;
                data.length = currentSize
            }else{
                alert('stack is already empty')
            }
        }


        push(10)
        push(20)
        push(30)
        push(40)
        push(50)
        // push(60)
        // push(70)
        // push(80)
        // push(90)
        // pop
        
        push(70)
        push(80)
        push(90)
        // pop()
        // pop()
        console.log(data);
        nums = []
        nums.length
        </script>
</body>
</html>