Software Development Exam > Software Development Questions > What will be the output of the following code...
Start Learning for Free
What will be the output of the following code snippet?
var x = 10;
function foo() {
console.log(x);
if (false) {
var x = 20;
}
}
foo();
var x = 10;
function foo() {
console.log(x);
if (false) {
var x = 20;
}
}
foo();
- a)10
- b)20
- c)undefined
- d)ReferenceError
Correct answer is option 'A'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Most Upvoted Answer
What will be the output of the following code snippet?var x = 10;funct...
Explanation:
The output of the code snippet will be 10.
Code Explanation:
1. The variable x is declared and assigned a value of 10.
2. The function foo() is defined, which logs the value of x to the console.
3. Inside the function, there is an if statement with a condition of false.
4. Inside the if statement, a new variable x is declared and assigned a value of 20.
5. Since the condition of the if statement is false, the code inside the if statement is not executed.
6. The function foo() is called, which logs the value of x to the console.
7. As there is no variable x declared inside the function foo(), it uses the variable x declared in the outer scope.
8. Thus, the value of x is 10 and it is logged to the console.
Key Points:
- The variable x is hoisted to the top of the function scope.
- Hoisting is a JavaScript behavior where variable and function declarations are moved to the top of their containing scope before code execution.
- Since the variable x is hoisted, the code inside the if statement is actually interpreted as:
```
var x;
if (false) {
x = 20;
}
```
- As the if statement is never executed, the value of x remains unchanged as 10.
- Therefore, when the function foo() is called, it logs the value of x as 10.
The output of the code snippet will be 10.
Code Explanation:
1. The variable x is declared and assigned a value of 10.
2. The function foo() is defined, which logs the value of x to the console.
3. Inside the function, there is an if statement with a condition of false.
4. Inside the if statement, a new variable x is declared and assigned a value of 20.
5. Since the condition of the if statement is false, the code inside the if statement is not executed.
6. The function foo() is called, which logs the value of x to the console.
7. As there is no variable x declared inside the function foo(), it uses the variable x declared in the outer scope.
8. Thus, the value of x is 10 and it is logged to the console.
Key Points:
- The variable x is hoisted to the top of the function scope.
- Hoisting is a JavaScript behavior where variable and function declarations are moved to the top of their containing scope before code execution.
- Since the variable x is hoisted, the code inside the if statement is actually interpreted as:
```
var x;
if (false) {
x = 20;
}
```
- As the if statement is never executed, the value of x remains unchanged as 10.
- Therefore, when the function foo() is called, it logs the value of x as 10.
Free Test
FREE
| Start Free Test |
Community Answer
What will be the output of the following code snippet?var x = 10;funct...
The 'var' declaration inside the if block is hoisted to the top of the function scope. However, since the condition is always false, the assignment 'var x = 20' is never executed. The output is 10.
Attention Software Development Students!
To make sure you are not studying endlessly, EduRev has designed Software Development study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Software Development.
|
Explore Courses for Software Development exam
|
|
Top Courses for Software DevelopmentView all
What will be the output of the following code snippet?var x = 10;function foo() { console.log(x); if (false) { var x = 20; }}foo();a)10b)20c)undefinedd)ReferenceErrorCorrect answer is option 'A'. Can you explain this answer?
Question Description
What will be the output of the following code snippet?var x = 10;function foo() { console.log(x); if (false) { var x = 20; }}foo();a)10b)20c)undefinedd)ReferenceErrorCorrect answer is option 'A'. Can you explain this answer? for Software Development 2024 is part of Software Development preparation. The Question and answers have been prepared according to the Software Development exam syllabus. Information about What will be the output of the following code snippet?var x = 10;function foo() { console.log(x); if (false) { var x = 20; }}foo();a)10b)20c)undefinedd)ReferenceErrorCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Software Development 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What will be the output of the following code snippet?var x = 10;function foo() { console.log(x); if (false) { var x = 20; }}foo();a)10b)20c)undefinedd)ReferenceErrorCorrect answer is option 'A'. Can you explain this answer?.
What will be the output of the following code snippet?var x = 10;function foo() { console.log(x); if (false) { var x = 20; }}foo();a)10b)20c)undefinedd)ReferenceErrorCorrect answer is option 'A'. Can you explain this answer? for Software Development 2024 is part of Software Development preparation. The Question and answers have been prepared according to the Software Development exam syllabus. Information about What will be the output of the following code snippet?var x = 10;function foo() { console.log(x); if (false) { var x = 20; }}foo();a)10b)20c)undefinedd)ReferenceErrorCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Software Development 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What will be the output of the following code snippet?var x = 10;function foo() { console.log(x); if (false) { var x = 20; }}foo();a)10b)20c)undefinedd)ReferenceErrorCorrect answer is option 'A'. Can you explain this answer?.
Solutions for What will be the output of the following code snippet?var x = 10;function foo() { console.log(x); if (false) { var x = 20; }}foo();a)10b)20c)undefinedd)ReferenceErrorCorrect answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for Software Development.
Download more important topics, notes, lectures and mock test series for Software Development Exam by signing up for free.
Here you can find the meaning of What will be the output of the following code snippet?var x = 10;function foo() { console.log(x); if (false) { var x = 20; }}foo();a)10b)20c)undefinedd)ReferenceErrorCorrect answer is option 'A'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
What will be the output of the following code snippet?var x = 10;function foo() { console.log(x); if (false) { var x = 20; }}foo();a)10b)20c)undefinedd)ReferenceErrorCorrect answer is option 'A'. Can you explain this answer?, a detailed solution for What will be the output of the following code snippet?var x = 10;function foo() { console.log(x); if (false) { var x = 20; }}foo();a)10b)20c)undefinedd)ReferenceErrorCorrect answer is option 'A'. Can you explain this answer? has been provided alongside types of What will be the output of the following code snippet?var x = 10;function foo() { console.log(x); if (false) { var x = 20; }}foo();a)10b)20c)undefinedd)ReferenceErrorCorrect answer is option 'A'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice What will be the output of the following code snippet?var x = 10;function foo() { console.log(x); if (false) { var x = 20; }}foo();a)10b)20c)undefinedd)ReferenceErrorCorrect answer is option 'A'. Can you explain this answer? tests, examples and also practice Software Development tests.
|
|
Explore Courses for Software Development exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup