queue.js

module.exports = class MyQueue {
	constructor() {
		this.items = []; 
	}
	
	// enqueue function 
	enqueue(element) {     
			// adding element to the queue 
			this.items.push(element); 
	}

		// dequeue function 
	dequeue(element) 
	{ 
			// removing element from the queue 
			// returns underflow when called  
			// on empty queue 
			if(this.isEmpty()) 
					return "Underflow"; 
			return this.items.shift(); 
	} 

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

	// isEmpty function 
	isEmpty() { 
			// return true if the queue is empty. 
			return this.items.length == 0; 
	} 

	// asString function 
	asString() {

			let str = ""; 
			for(let i = 0; i < this.items.length; i++) 
					str += this.items[i] +" "; 
			return str; 
	} 
}