Which feature in ES6 provides a concise syntax for writing functions?

Which feature in ES6 provides a concise syntax for writing functions?

• A. Promise chaining
• B. Arrow functions
• C. Prototypal inheritance
• D. Default parameters

Answer: (B)

Arrow functions in ES6 provide a concise syntax for writing functions. They let you replace a longer function expression like function (a, b) { return a + b; } with a slimmer form such as (a, b) => a + b. This compact notation is especially handy for inline callbacks and small utilities, where you can even omit the braces and the return keyword for a single expression. In addition, arrow functions capture the surrounding this value, so they’re often easier to use in callbacks without worrying about binding this. The other options don’t focus on concise function syntax. Promise chaining deals with sequencing asynchronous operations, not how you write function definitions. Prototypal inheritance is about how objects inherit properties, not about shortening function syntax. Default parameters provide fallback values for parameters, but they don’t change the way you write the function’s syntax.

Arrow functions in ES6 provide a concise syntax for writing functions. They let you replace a longer function expression like function (a, b) { return a + b; } with a slimmer form such as (a, b) => a + b. This compact notation is especially handy for inline callbacks and small utilities, where you can even omit the braces and the return keyword for a single expression. In addition, arrow functions capture the surrounding this value, so they’re often easier to use in callbacks without worrying about binding this.

The other options don’t focus on concise function syntax. Promise chaining deals with sequencing asynchronous operations, not how you write function definitions. Prototypal inheritance is about how objects inherit properties, not about shortening function syntax. Default parameters provide fallback values for parameters, but they don’t change the way you write the function’s syntax.