Arrow Functions

The video tutorial introduces arrow functions in ES6, highlighting their benefits such as saving lines of code and maintaining lexical 'this'. It demonstrates converting regular functions to arrow functions, using them with return values, handling parameters, and employing them as callbacks. The tutorial also shows how to simplify Fetch API code using arrow functions, making the code cleaner and more efficient.

What is one of the main benefits of using arrow functions in JavaScript?

• They allow for dynamic typing.

• They provide a new way to declare variables.

• They help in reducing the number of lines of code.

• They enable the use of multiple inheritance.

How do you convert a regular function to an arrow function?

• Add curly braces around the function body.

• Use the var keyword instead of const.

• Add the function keyword and remove the parentheses.

• Replace the function keyword with an arrow (=>) and remove the curly braces if the body is a single line.

What must you do when returning an object literal from an arrow function?

• Wrap the object in parentheses.

• Declare the object with var.

• Use a semicolon after the object.

• Use the return keyword.

When can you omit parentheses around parameters in an arrow function?

• When the function body is empty.

• When there are two parameters.

• When there is exactly one parameter.

• When there are no parameters.

What is required when an arrow function has multiple parameters?

• Use a semicolon between parameters.

• Wrap the parameters in parentheses.

• Use the var keyword for each parameter.

• Declare the parameters as constants.

How can arrow functions be used with the map function?

• To find the maximum element in an array.

• To sort elements in an array.

• To transform each element in an array.

• To filter elements in an array.

What is a key advantage of using arrow functions in asynchronous code?

• They automatically handle errors.

• They allow for synchronous execution.

• They simplify the syntax of promise chains.

• They make the code run faster.

In the context of promises, what does the arrow function syntax help to eliminate?

• The need for parentheses around single parameters.

• The need for the catch block.

• The need for the function keyword.

• The need for the return keyword.

What does the lexical 'this' in arrow functions refer to?

• The object in which the arrow function was defined.

• The first parameter of the function.

• The global object.

• The object that called the function.

How does using arrow functions affect the readability of asynchronous code?

• It makes the code harder to understand.

• It has no effect on readability.

• It requires more comments to understand.

• It makes the code more concise and easier to read.