JavaScript Function

What is the primary purpose of a function in programming?

Functions allow code to be reused throughout your program.

A function is a block of code that can be ______ when needed.

You have a block of code that calculates the total price with tax and you need to use it in several parts of your application. What should you do?

In JavaScript, a method is best described as

A method is what an object ______.

The Array object in JavaScript contains both properties (like length) and methods (like push and pop).

Given a string variable name = "Alice", which built-in method would you use to convert it to uppercase?

The global scope is the default scope for all code running in script mode.

Which of the following is NOT a type of scope in JavaScript?

Block scope is created with a pair of ______ braces.

You declare a variable with let inside a for-loop. What scope does this variable have?

The call stack is used by the JavaScript interpreter to keep track of function calls.

The call stack follows which of the following order?

When a function completes execution, its execution context is ______ off the call stack.

If function A calls function B, and then function B calls function C, describe the order in which the functions are executed and removed from the call stack.

The arguments object is available inside arrow functions.

Which statement about the arguments object is correct?

The arguments object has a ______ property that indicates the number of arguments passed to the function.

You have a function that uses the arguments object, but you want to use array methods like map or reduce. What can you do?

An IIFE is executed immediately after it is defined.

In an IIFE, why do we wrap the function in parentheses?

IIFE stands for ______.

If you need to run some initialization code that should not pollute the global namespace, which pattern should you use?

Arrow functions have their own this keyword.

What is one advantage of using arrow functions in JavaScript?

Arrow functions use the ______ operator to define the function body.

You need to write a short function that returns the sum of two numbers. Which syntax is most appropriate?

Default parameters allow you to set default values for function parameters if no value is provided.

What happens when undefined is passed to a parameter with a default value?

If no value is passed for a parameter with a default value, the parameter is set to its ______ value.

Write a simple function greet that prints "Hello, [name]!" but defaults to "Guest" if no name is provided.

The rest parameter syntax uses three dots (...) to collect all remaining function arguments into an array.

Where must the rest parameter be placed in a function’s parameter list?

Rest parameters allow a function to accept an ______ number of arguments.

You need to create a function that calculates the sum of any number of inputs. How would you implement this using rest parameters?

A recursive function is one that calls itself during execution.

Which of the following is essential for a recursive function to work correctly?

The condition that stops a recursive function from calling itself is known as the ______ case.

Write a recursive function to compute the factorial of a number. Clearly indicate the base case and the recursive call.

Recursion always leads to a stack overflow.

Which of the following scenarios is best suited for a recursive solution?

In JavaScript, functions can be nested inside other functions.

Which of the following best describes a closure?

A closure allows a function to ______ access to variables from its enclosing scope even after that outer function has finished execution.

You have a function that returns another function and uses a variable from the outer function. What concept does this demonstrate?

Arrow functions do not have their own arguments object.

What is a key difference between the arguments object and rest parameters?

With rest parameters, you can directly use array methods like ______, filter, or reduce on the collected arguments.

You are refactoring an older function that uses the arguments object. To modernize your code, what should you replace the arguments object with?