Angular Interview Practice

What are fat-arrow functions in JavaScript?

1. Traditional function declarations

2. A shorthand syntax for writing functions

3. A way to define async functions

4. An old JavaScript feature

The correct answer is: A shorthand syntax for writing functions

Fat-arrow functions, also known simply as arrow functions, are indeed a shorthand syntax for writing functions in JavaScript. They were introduced in ES6 (ECMAScript 2015) and provide a more concise way to define functions compared to traditional function expressions. One of the main benefits of using fat-arrow functions is that they do not bind their own `this` context; instead, they lexically inherit the `this` value from the surrounding code. This characteristic makes them particularly useful in scenarios where you want to maintain the context of `this` from the enclosing scope, such as in event handlers or when dealing with asynchronous code. Additionally, arrow functions do not require the use of the `function` keyword and can omit parentheses if they take a single parameter, further simplifying the syntax. This makes the code cleaner and reduces visual clutter, appealing to developers looking for efficiency in writing code. While the other options mention various function definitions and features, they do not accurately describe fat-arrow functions. Traditional function declarations and async functions follow different syntax and usage patterns. Arrow functions specifically refer to the concise syntax and behavior introduced in modern JavaScript, distinguishing them from older features.