DSA/05-stack.js at main · sanathecoder/DSA · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
class stack{
    constructor(){
        this.s  = []
    }

    length(){
        return this.s.length
    }

    push(value){
        this.s.push(value)
    }

    peek(){
        if(this.s.length === 0){
            throw new Error("Stack is empty");

        }else{
            return this.s[this.s.length - 1]
        }
    }
    pop(){
         return this.s.pop()
    }

    search(value){
        for(let i = this.s.length-1; i>=0; i--){
            if(this.s[i] === value){
                return this.s.length - i
            }

        }
         return -1
    }
}

let stk = new stack()
stk.push(10)
stk.push(20)
stk.push(30)
stk.push(40)
stk.push(50)

// console.log(stk.length())
// console.log(stk.peek())
// console.log(stk.pop())
// console.log(stk.length())
// console.log(stk.peek())

console.log(stk.search(30))