Monitor your applications and troubleshoot problems in your deployed applications, an open-source alternative to DataDog, New Relic, etc.

SigNoz helps developers monitor applications and troubleshoot problems in their deployed applications. SigNoz uses distributed tracing to gain visibility into your software stack.

👉 You can see metrics like p99 latency, error rates for your services, external API calls and individual end points.

👉 You can find the root cause of the problem by going to the exact traces which are causing the problem and see detailed flamegraphs of individual request traces.

👇 Features:

• Application overview metrics like RPS, 50th/90th/99th Percentile latencies, and Error Rate
• Slowest endpoints in your application
• See exact request trace to figure out issues in downstream services, slow DB queries, call to 3rd party services like payment gateways, etc
• Filter traces by service name, operation, latency, error, tags/annotations.
• Aggregate metrics on filtered traces. Eg, you can get error…

You Don't Know JS Yet (book series) - 2nd Edition

This is a series of books diving deep into the core mechanisms of the JavaScript language. This is the second edition of the book series:

     ...

To read more about the motivations and perspective behind this book series, check out the Preface.

If you're looking for the previous first edition books, they can be found here.

Premier Sponsor

This edition of the YDKJS book series is exclusively sponsored by Frontend Masters.

Frontend Masters is the gold standard for top-of-the-line expert training material in frontend-oriented software development. With over 150 courses on all things frontend, this should be your first and only stop for quality video training on HTML, CSS, JS, and related technologies.

I teach all my workshops exclusively through Frontend Masters. If you like this book content, please check out my video training courses.

I want…

JavaScript Algorithms and Data Structures

This repository contains JavaScript based examples of many popular algorithms and data structures.

Each algorithm and data structure has its own separate README with related explanations and links for further reading (including ones to YouTube videos).

Read this in other languages: 简体中文 繁體中文 한국어 日本語, Polski, Français, Español, Português, Русский, Türk, Italiana, Bahasa Indonesia, Українська, Arabic, Deutsch

☝ Note that this project is meant to be used for learning and researching purposes only, and it is not meant to be used for production.

Data Structures

A data structure is a particular way of organizing and storing data in a computer so that it can be accessed and modified efficiently. More precisely, a data structure is a collection of data values, the relationships among them, and the functions or operations that can…

30 seconds of code

Short JavaScript code snippets for all your development needs

• Visit our website to view our snippet collection.
• Use the Search page to find snippets that suit your needs. You can search by name, tag, language or using a snippet's description. Just start typing a term and see what comes up.
• Browse the JavaScript Snippet collection to see all the snippets in this project or click individual tags at the top of the same page to narrow down your search to a specific tag.
• Click on each snippet card to view the whole snippet, including code, explanation and examples.
• You can use the button at the bottom of a snippet card to copy the code to clipboard.
• If you like the project, give it a star. It means a lot to the people maintaining it.

Want to contribute?

• If you want to help us improve, take a…

  Front-End Checklist  

🚨 Currently working on a V2 of frontendchecklist.io,
feel free to discuss any feature you would like to see in the next version

The Front-End Checklist is an exhaustive list of all elements you need to have / to test before launching your website / HTML page to production.

  How To Use • Contributing • Website • Product Hunt

Other Checklists:
  🎮 Front-End Performance Checklist • 💎 Front-End Design Checklist

It is based on Front-End developers' years of experience, with the additions coming from some other open-source checklists.

How to use?

All items in the Front-End Checklist are required for the majority of the projects, but some elements can be omitted or are not essential (in the case of an administration web app, you may not need RSS feed for example). We choose to use 3 levels of flexibility:

• means that the item is recommended but can be…

Front End Interview Handbook

Credits: Illustration by @yangheng

Read on the website

What is this?

Unlike typical software engineer job interviews, front-end job interviews have less emphasis on algorithms and have more questions on intricate knowledge and expertise about the domain — HTML, CSS, JavaScript, just to name a few areas.

While there are some existing resources to help front end developers in preparing for interviews, they aren't as abundant as materials for a software engineer interview. Among the existing resources, probably the most helpful question bank would be Front-end Developer Interview Questions. Unfortunately, I couldn't find many complete and satisfactory answers to these questions online, hence here is my attempt at answering them. Being an open source repository, the project can live on with the support of the community as the state of web evolves.

Why do I want this?

Go From Zero to Hero

Go from zero…

Web Development for Beginners - A Curriculum

Azure Cloud Advocates at Microsoft are pleased to offer a 12-week, 24-lesson curriculum all about JavaScript, CSS, and HTML basics. Each lesson includes pre- and post-lesson quizzes, written instructions to complete the lesson, a solution, an assignment and more. Our project-based pedagogy allows you to learn while building, a proven way for new skills to 'stick'.

Hearty thanks to our authors Jen Looper, Chris Noring, Christopher Harrison, Jasmine Greenaway, Yohan Lasorsa, Floor Drees, and sketchnote artist Tomomi Imura!

Getting Started

Teachers, we have included some suggestions on how to use this curriculum. We'd love your feedback in our discussion forum!

Students, to use this curriculum on your own, fork the entire repo and complete the exercises on your own, starting with a pre-lecture quiz, then reading the lecture and completing the rest of the activities. Try to create the projects…

React Interview Questions & Answers

Click ⭐if you like the project. Pull Request are highly appreciated. Follow me @SudheerJonna for technical updates.

3600 Tech Interview Questions. Answered

Note: This repository is specific to ReactJS. Please check Javascript Interview questions for core javascript questions.

Downloading PDF/Epub formats

You can download the PDF and Epub version of this repository from the latest run on the actions tab.

Table of Contents