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JavaScript Functions

JavaScript Functions - Important Points


21. What is the difference between a named function and an anonymous function in JavaScript?

A. Named functions can be called from anywhere in the code, while anonymous functions cannot be called

B. Anonymous functions are defined without a name, while named functions have a name

C. Named functions are hoisted, while anonymous functions are not hoisted

D. Anonymous functions can be assigned to variables, while named functions cannot be assigned to variables

Discuss Work Space

Answer: option b

Explanation:

A named function has a name and can be called by name from anywhere in the code. An anonymous function does not have a name and is usually defined and used inline or assigned to a variable.

22. What is the purpose of the "arguments" object in a JavaScript function?

A. To specify a function's input parameters

B. To store a function's local variables

C. To create a new array of arguments passed to a function

D. To access all arguments passed to a function as an array-like object

Discuss Work Space

Answer: option d

Explanation:

The "arguments" object is a built-in object in JavaScript that contains an array-like list of all arguments passed to a function. It can be used to access individual arguments and their values.

23. What is a closure in JavaScript?

A. A function that takes another function as an argument

B. A function that returns another function

C. A function that accesses variables outside its own scope

D. A function that is used to create objects

Discuss Work Space

Answer: option c

Explanation:

A closure is a function that has access to variables in its outer (enclosing) function's scope chain. It can access and modify these variables even after the outer function has returned.

24. What is a higher-order function in JavaScript?

A. A function that takes another function as an argument

B. A function that returns another function

C. A function that accesses variables outside its own scope

D. A function that is used to create objects

Discuss Work Space

Answer: option a

Explanation:

A higher-order function is a function that takes another function as an argument or returns a function as its output. Higher-order functions are often used for functional programming.

25. What is the purpose of the "apply" and "call" methods in JavaScript?

A. To create a new function with a specified "this" value and arguments provided as an array

B. To call a function with a specified "this" value and arguments provided as individual arguments

C. To bind a function to a specific "this" value

D. To create a new object with a specified prototype object and properties

Discuss Work Space

Answer: option b

Explanation:

The "apply" and "call" methods are used to call a function with a specified "this" value and arguments provided as individual arguments. The "apply" method takes an array of arguments, while the "call" method takes individual arguments.


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