JavaScript Solution to Number of Recent Calls

JavaScript Solution to Number of Recent Calls

Number of Recent Calls is one of the leetcode questions that tripped us up. (As you can see how many downvotes it has.🧐) In the following blog, I’ll try to explain the problem and the example line by line to make it easier to understand.

Number of Recent Calls is one of the leetcode questions that tripped us up. (As you can see how many downvotes it has.🧐) In the following blog, I’ll try to explain the problem and the example line by line to make it easier to understand.


Explanation of the question

Write a class RecentCounter to count recent requests.

The key point above is class, we need to implement a class, not a function.

It has only one method: ping(int t), where _ t_ represents some time in milliseconds.

The class instance needs to have _**_ping_ method, which is a function that takes _t**, an integer in the range of `1 <= t <= 10^9_` , as an argument._

Return the number of pings that have been made from 3000 milliseconds ago until now.

The _**_ping**_ method return value is an integer._

Any ping with time in [t - 3000, t] will count, including the current ping.

Any _ _previous t _ _that has been called, which is in the range of [current t-3000, _**_current t**], will be counted.

It is guaranteed that every call to ping uses a strictly larger value of t than before.

Each call of _**_ping_, the argument _t**_ increases, it forms an ascending integer list._

Example 1:

Input: inputs = ["RecentCounter","ping","ping","ping","ping"], 
/*
first, we create a new RecentCounter object
obj = new RecentCounter()
then, we call ping four times with four different t 
*/
inputs = [[],[1],[100],[3001],[3002]]
/*
obj.ping(1) 
obj.ping(100)
obj.ping(3001)
obj.ping(3002)
*/
Output: [null,1,2,3,3]
/*
object initialized, ping is not called, no return value, null
obj.ping(1) should return 1
obj.ping(100) should return 2
obj.ping(3001) should return 3
obj.ping(3002) should return 3
*/

Note:

  1. Each test case will have at most 10000 calls to ping.
  2. Each test case will call ping with strictly increasing values of t.
  3. Each call to ping will have 1 <= t <= 10^9.

leetcode data-structures queue javascript programming

Bootstrap 5 Complete Course with Examples

Bootstrap 5 Tutorial - Bootstrap 5 Crash Course for Beginners

Nest.JS Tutorial for Beginners

Hello Vue 3: A First Look at Vue 3 and the Composition API

Building a simple Applications with Vue 3

Deno Crash Course: Explore Deno and Create a full REST API with Deno

How to Build a Real-time Chat App with Deno and WebSockets

Convert HTML to Markdown Online

HTML entity encoder decoder Online

JavaScript Data Structures: Queues and Stacks

A departure from the usual JavaScript problem-solving tutorials and discuss two common data structures, Queue and Stack.

Javascript Data Structure — Introduction

In this series, I will describe the different data structures and their used cased. The next series will contain more depth on each data structure. I used javascript for example, but all data structures can be implemented in all high-level programming languages.

The Queue JavaScript Data Structure

A Queue is Linear Data Structure where data elements are arranged sequentially in an array. Stacks and Queues are similar, but Queues use the process of FIFO (First In, First Out). To achieve this, the push and shift Javascript methods are used to create a Queue class in Javascript.

JavaScript Data Structure  - Stack, Queue in detail

Meanwhile, JavaScript achieves a leading position in web technology. So, it is the best time to learn JavaScript and its stuff. After learning the basics concept you have to plan some advanced topics.

4 Tips To Become A Successful Entry-Level Data Analyst

Companies across every industry rely on big data to make strategic decisions about their business, which is why data analyst roles are constantly in demand. This post, you'll know 4 Tips To Become A Successful Entry-Level Data Analyst