JavaScript test

The JavaScript test assesses the candidate’s proficiency in the JavaScript programming language, which is essential for building interactive websites and web applications. The test covers a range of topics, starting with the basics of syntax, variables, and operators. Candidates should be comfortable with JavaScript’s primitive data types, such as numbers, strings, booleans, null, and undefined, and how to manipulate these values using operators.

Functions are a core aspect of JavaScript programming, so the test also evaluates the understanding of function declarations, expressions, parameters, and return values. Additionally, candidates must demonstrate knowledge of scope and closures, which are crucial for managing variables in different contexts.

Objects and arrays are fundamental to JavaScript, and the test includes questions on object creation, manipulation, and iteration. Understanding how to use built-in methods for array manipulation and object manipulation is critical. The test also delves into event handling, where candidates are expected to demonstrate the ability to add, remove, and manage event listeners for DOM (Document Object Model) elements.

The test goes beyond basic JavaScript and explores asynchronous programming concepts, including callbacks, promises, and async/await syntax, which are essential for handling asynchronous operations like API calls. Moreover, understanding how to handle errors through try-catch blocks and throwing custom errors is covered.

JavaScript’s Object-Oriented Programming (OOP) principles, including prototypes and inheritance, will also be assessed, as these concepts are important for structuring maintainable code. The test evaluates knowledge of ES6+ features like arrow functions, template literals, destructuring, and spread/rest operators.

Finally, candidates will be tested on their knowledge of modern JavaScript frameworks and libraries, such as React, Angular, or Vue.js, and how to interact with them using JavaScript.