data-structures/stack.js at main · malikhisyam/data-structures · GitHub

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class Node {
    value;
    top;
    bottom;

    constructor(value, top = null, bottom = null) {
        this.value = value;
        this.top = top;
        this.bottom = bottom;
    }
}

class Stack {
    top = null;

    add(value) {
        const newNode = new Node(value);

        if(this.top) {
            newNode.bottom = this.top;
            this.top.top = newNode;
            this.top = newNode;
            return;
        }

        this.top = newNode;
    };

    remove() {

        if (this.top) {

            const oldTop = this.top;
            this.top = this.top.bottom;

            if (this.top) {
                this.top.top = null;
            }

            oldTop.bottom = null;
        }
    }

    find(value) {
        let pointer = this.top;

        while(pointer) {
            if(pointer.value == value) {
                return "Found " + value;
            }
            pointer = pointer.bottom;
        }

        return "Not found";
    }

    print() {
        let pointer = this.top;

        while(pointer) {
            console.log(pointer.value);
            pointer = pointer.bottom;
        }
    }

}

const stack = new Stack();

stack.add(5);
stack.add(1);
stack.add(3);
stack.remove();

console.log(stack.find(6));

stack.print();