[100% Off] Javascript Tooling - Practice Questions 2026

JavaScript Tooling 120 unique high-quality test questions with detailed explanations!

Added on February 27, 2026 IT & Software 4 min read

What you’ll learn

Understand NPM and Yarn for efficient JavaScript package management.
Configure and optimize Webpack builds for development and production.
Implement modern JavaScript tooling workflows for real-world projects.
Debug
analyze
and improve project performance using best practices.

Requirements

Basic understanding of JavaScript and web development.
Familiarity with using a code editor like VS Code.
Node.js installed on your system.
No prior experience with NPM
Yarn
or Webpack required.

Description

Master JavaScript Tooling: NPM, Yarn, and Webpack Practice Exams

Welcome to the definitive practice resource designed to help you master the essential ecosystem of modern JavaScript development. Whether you are preparing for a technical interview or looking to solidify your workflow efficiency, these practice exams provide a rigorous environment to test your knowledge of NPM, Yarn, and Webpack.

Why Serious Learners Choose These Practice Exams

In the rapidly evolving world of frontend development, understanding how to manage packages and bundle assets is just as important as writing the code itself. These practice tests go beyond surface-level definitions, challenging you to understand the “why” behind dependency management and build optimizations. Serious learners choose this course because it bridges the gap between theoretical knowledge and professional-grade implementation.

Course Structure

Basics / Foundations
This section covers the fundamental command-line interfaces and the role of the package. json file. You will be tested on initializing projects, understanding semantic versioning (SemVer), and the basic differences between package managers.
Core Concepts
Focus on the essential mechanics of dependency installation. This includes understanding the difference between dependencies and devDependencies, global versus local installations, and basic Webpack entry and output configurations.
Intermediate Concepts
Dive deeper into configuration files. You will tackle topics like Webpack Loaders (Babel, CSS, File loaders), Plugins, and managing lock files (package-lock. json and yarn. lock) to ensure environment consistency.
Advanced Concepts
Challenge yourself with complex build optimizations. This module covers Code Splitting, Tree Shaking, Hot Module Replacement (HMR), and environment-specific configurations (Production vs. Development modes).
Real-world Scenarios
Apply your knowledge to solve practical problems. Questions in this section simulate common debugging tasks, such as resolving dependency conflicts, fixing broken builds, and optimizing slow bundle sizes.
Mixed Revision / Final Test
A comprehensive simulation of a professional assessment. This final exam pulls from all previous sections to ensure you have a holistic grasp of JavaScript tooling and are ready for any real-world challenge.

Sample Practice Questions

QUESTION 1

Which Webpack feature is specifically designed to remove unused “dead” code from the final bundle to reduce file size?

Option 1: Hot Module Replacement
Option 2: Tree Shaking
Option 3: Code Splitting
Option 4: Lazy Loading
Option 5: Minification

CORRECT ANSWER

Option 2

CORRECT ANSWER EXPLANATION

Tree Shaking is a form of dead code elimination. It relies on the static structure of ES2015 module syntax (import and export) to detect which code is actually being used and excludes the rest from the final bundle.

WRONG ANSWERS EXPLANATION

Option 1: Hot Module Replacement (HMR) exchanges, adds, or removes modules while an application is running, without a full reload. It is for development speed, not bundle size.
Option 3: Code Splitting allows you to split your code into various bundles which can then be loaded on demand or in parallel, but it does not delete unused code.
Option 4: Lazy Loading is a technique to defer the loading of non-critical resources at page load time.
Option 5: Minification reduces file size by removing whitespace and shortening variable names, but it does not analyze whether a function or module is being used.

QUESTION 2

When using NPM or Yarn, what is the primary purpose of the lock file (e. g. , package-lock. json or yarn. lock)?

Option 1: To list all available scripts for the project
Option 2: To encrypt the source code for production
Option 3: To define the license of the project
Option 4: To ensure deterministic installs across different environments
Option 5: To store the author’s contact information

CORRECT ANSWER

Option 4

CORRECT ANSWER EXPLANATION

Lock files record the exact version of every dependency and sub-dependency installed. This ensures that every developer on a team and the CI/CD server installs the exact same dependency tree, preventing “it works on my machine” bugs.

WRONG ANSWERS EXPLANATION

Option 1: Scripts are defined in the scripts object within the package. json file, not the lock file.
Option 2: Lock files do not provide encryption for the source code.
Option 3: The license is specified in the license field of the package. json file.
Option 5: Author information is a metadata field in the package. json file.

Course Features

Welcome to the best practice exams to help you prepare for your JavaScript Tooling (NPM, Yarn, Webpack).