JavaScript Functions

JavaScript Functions - Important Points

16.		What is the output of the following code snippet? var x = 10; function myFunction() { console.log(x); var x = 5; } myFunction();

16.

What is the output of the following code snippet?

var x = 10;
function myFunction() {
console.log(x);
var x = 5;
}
myFunction();

A. 10

B. 5

C. undefined

D. Error

View Answer Discuss Work Space

Answer: option c

Explanation:

The variable x is declared inside the function with the var keyword, which means it has function scope. Therefore, the declaration of x inside the function is hoisted to the top of the function, and the value of x is undefined when it is logged to the console.

17.		Which of the following is a way to create a closure in JavaScript?

A. Returning a function from another function

B. Using the "with" statement

C. Using the "debugger" statement

D. Using the "switch" statement

View Answer Discuss Work Space

Answer: option a

Explanation:

Returning a function from another function creates a closure, which allows the returned function to access the variables and parameters of the outer function.

18.		What is the output of the following code snippet? var x = 1; function myFunction() { console.log(x); } myFunction();

18.

What is the output of the following code snippet?

var x = 1;
function myFunction() {
console.log(x);
}
myFunction();

A. undefined

B. null

C. 0

D. 1

View Answer Discuss Work Space

Answer: option d

Explanation:

The variable x is declared outside the function with a value of 1. Inside the function, the value of x is accessed and logged to the console, which is 1.

19.		What is the purpose of the "bind" method in JavaScript?

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

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

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

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

View Answer Discuss Work Space

Answer: option d

Explanation:

The "bind" method is used to bind a function to a specific "this" value, which creates a new function with the same body and scope as the original function but with a fixed "this" value.

20.		What is the output of the following code snippet? function myFunction(x) { return function(y) { return x + y; }; } var addFive = myFunction(5); var result = addFive(10); console.log(result);

20.

What is the output of the following code snippet?

function myFunction(x) {
return function(y) {
return x + y;
};
}
var addFive = myFunction(5);
var result = addFive(10);
console.log(result);

A. 5

B. 10

C. 15

D. 20

View Answer Discuss Work Space

Answer: option c

Explanation:

The function myFunction returns a new function that takes a parameter y and returns the sum of x and y. The variable addFive is assigned to the result of calling myFunction with an argument of 5. The variable result is assigned to the result of calling addFive with an argument of 10, which returns 15. Therefore, the output is 15.

Worried about Placements?

Get on FAST TRACK COURSE

JavaScript Functions

Subscribe for Latest Career Trends

Use AI and ChatGPT for Career Guidance

Unlock Your Future

Worried for Placements in 2024?

Join FAST TRACK Course

Supercharge Your SUCCESS

Join All in One Placement Mock Tests-2024