Quiz: Quiz 5: Functions | Module 5: Functions

Module 5: Functions

Lessons

Declaring and Calling Functions
Parameters, Return Values, Local vs. Global Variables (Scope)
Function Expressions and Arrow Functions
Callback Functions
Recursion: Understanding and Writing Basic Recursive Functions
Timing: setTimeout() and setInterval()

Labs

Greeting Function, Factorial, and Timed Message

Quizzes

Quiz 5: Functions

Module 5: Functions

Quiz: Quiz 5: Functions

1. How do you declare a basic function in JavaScript?

`function = myFunction() {}`

`def myFunction() {}`

`function myFunction() {}`

`myFunction: function() {}`

2. What is a "parameter" in the context of a function?

The value returned by the function.

A variable declared inside the function.

A placeholder for a value that a function expects to receive when it is called.

The actual value passed to a function when it is called.

3. What does a function return by default if it does not have an explicit `return` statement or `return;`?

`null`

`0`

`false`

`undefined`

4. What is the key characteristic of an arrow function `() => ...` compared to a traditional function expression regarding the `this` keyword?

Arrow functions have their own `this` bound to the global object.

Arrow functions do not have their own `this`; they inherit it from the surrounding lexical scope.

Arrow functions always bind `this` to the object that called them.

Arrow functions require `this` to be explicitly passed as an argument.

5. What is a callback function?

A function that calls another function.

A function that is passed as an argument to another function and is executed later.

A function that can only be called once.

A built-in JavaScript function for handling errors.

6. What is the primary purpose of a "base case" in a recursive function?

To initialize the recursive function.

To perform the main calculation step.

To provide a condition that stops the recursion.

To call the function recursively.

7. Which timing function is used to execute a piece of code repeatedly at a specified interval?

`setTimeout()`

`setInterval()`

`requestAnimationFrame()`

`delay()`

8. Which syntax is used for an arrow function that takes no parameters and implicitly returns the string "Hello"?

`=> "Hello"`

`() => "Hello"`

`function() => "Hello"`

`void => "Hello"`

9. What is the value of `x` after the following code? `function test() { let x = 10; } test();`

undefined

Error: x is not defined

null

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