kantime-rule-engine/ruleEngineHelperMethods.js

A library for custom validation in the form based on the user defined json schema.

// Stack class 
class Stack {
    constructor() {
        this.items = [];
    }

    //To add element to Stack
    push(element) {
        this.items.push(element);
    }

    //remove element from the Stack and return that
    //return Underflow when Stack is Empty
    pop() {
        if (this.items.length == 0)
            return "Underflow";
        return this.items.pop();
    }

    //return the First element without removing it
    peek() {
        if (this.isEmpty())
            return "No elements in Stack";
        return this.items[this.items.length - 1];
    }

    //Return true if Stack is Empty
    isEmpty() {
        return this.items.length == 0;
    }

    //Return all elements in the Stack
    getStack() {
        return this.items;
    }
}

//Queue class 
class Queue {
    constructor() {
        this.items = [];
    }

    //To add element to Queue
    enqueue(element) {
        this.items.push(element);
    }

    //remove element from the Queue and return that
    //return Underflow when Queue is Empty
    dequeue() {
        if (this.isEmpty())
            return "Underflow";
        return this.items.shift();
    }

    //return the First element without removing it
    front() { 
        if (this.isEmpty())
            return "No elements in Queue";
        return this.items[0];
    }

    //Return true if Queue is Empty
    isEmpty() {
        return this.items.length == 0;
    }

    //Return all elements in the Queue
    getQueue() {
        return this.items;
    }
}

module.exports = { Stack, Queue }