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What is the output of the following code snippet?
var x = 5;
var x = 5;
function foo() {
console.log(x);
var x = 10;
function bar() {
console.log(x);
}
bar();
}
console.log(x);
var x = 10;
function bar() {
console.log(x);
}
bar();
}
foo();
- a)0, 0
- b)undefined, undefined
- c)10, 10
- d)undefined, 10
Correct answer is option 'D'. Can you explain this answer?
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Most Upvoted Answer
What is the output of the following code snippet?var x = 5;function fo...
The variable x is declared in the function foo but is not assigned a value before the first console.log statement. Therefore, it outputs undefined. Inside the bar function, it logs the value of x, which is 10.
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Community Answer
What is the output of the following code snippet?var x = 5;function fo...
Explanation:
The output of the code snippet is "undefined, 10".
- When the function `foo()` is called, the first `console.log(x)` statement is executed. However, at this point, the variable `x` is declared but not yet assigned a value. Therefore, the value of `x` is `undefined` inside the `foo()` function. So, the first `console.log(x)` statement prints `undefined`.
- Inside the `foo()` function, a new variable `x` is declared and assigned a value of `10`. This creates a new local variable `x` that shadows the global variable `x`. The global variable `x` is still undefined.
- The function `bar()` is defined inside the `foo()` function and called immediately. Inside the `bar()` function, the `console.log(x)` statement is executed. Since `x` is not declared in the `bar()` function, JavaScript looks for the variable in the scope chain. It first checks the local scope of `bar()`, where `x` is not defined. Then, it checks the scope of the parent function `foo()`, where `x` is defined. So, the `console.log(x)` statement prints `10`.
- Finally, the `foo()` function is called, and it executes the code inside it. This results in the output "undefined, 10" as explained above.
In summary, the variable `x` inside the `foo()` function is a local variable that shadows the global variable `x`. The first `console.log(x)` statement prints `undefined` because the local variable `x` is declared but not yet assigned a value. The second `console.log(x)` statement prints `10` because it refers to the local variable `x` within the `foo()` function.
The output of the code snippet is "undefined, 10".
- When the function `foo()` is called, the first `console.log(x)` statement is executed. However, at this point, the variable `x` is declared but not yet assigned a value. Therefore, the value of `x` is `undefined` inside the `foo()` function. So, the first `console.log(x)` statement prints `undefined`.
- Inside the `foo()` function, a new variable `x` is declared and assigned a value of `10`. This creates a new local variable `x` that shadows the global variable `x`. The global variable `x` is still undefined.
- The function `bar()` is defined inside the `foo()` function and called immediately. Inside the `bar()` function, the `console.log(x)` statement is executed. Since `x` is not declared in the `bar()` function, JavaScript looks for the variable in the scope chain. It first checks the local scope of `bar()`, where `x` is not defined. Then, it checks the scope of the parent function `foo()`, where `x` is defined. So, the `console.log(x)` statement prints `10`.
- Finally, the `foo()` function is called, and it executes the code inside it. This results in the output "undefined, 10" as explained above.
In summary, the variable `x` inside the `foo()` function is a local variable that shadows the global variable `x`. The first `console.log(x)` statement prints `undefined` because the local variable `x` is declared but not yet assigned a value. The second `console.log(x)` statement prints `10` because it refers to the local variable `x` within the `foo()` function.
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What is the output of the following code snippet?var x = 5;function foo() { console.log(x); var x = 10; function bar() { console.log(x); } bar();}foo();a)0, 0b)undefined, undefinedc)10, 10d)undefined, 10Correct answer is option 'D'. Can you explain this answer?
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What is the output of the following code snippet?var x = 5;function foo() { console.log(x); var x = 10; function bar() { console.log(x); } bar();}foo();a)0, 0b)undefined, undefinedc)10, 10d)undefined, 10Correct answer is option 'D'. 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 is the output of the following code snippet?var x = 5;function foo() { console.log(x); var x = 10; function bar() { console.log(x); } bar();}foo();a)0, 0b)undefined, undefinedc)10, 10d)undefined, 10Correct answer is option 'D'. 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 is the output of the following code snippet?var x = 5;function foo() { console.log(x); var x = 10; function bar() { console.log(x); } bar();}foo();a)0, 0b)undefined, undefinedc)10, 10d)undefined, 10Correct answer is option 'D'. Can you explain this answer?.
What is the output of the following code snippet?var x = 5;function foo() { console.log(x); var x = 10; function bar() { console.log(x); } bar();}foo();a)0, 0b)undefined, undefinedc)10, 10d)undefined, 10Correct answer is option 'D'. 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 is the output of the following code snippet?var x = 5;function foo() { console.log(x); var x = 10; function bar() { console.log(x); } bar();}foo();a)0, 0b)undefined, undefinedc)10, 10d)undefined, 10Correct answer is option 'D'. 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 is the output of the following code snippet?var x = 5;function foo() { console.log(x); var x = 10; function bar() { console.log(x); } bar();}foo();a)0, 0b)undefined, undefinedc)10, 10d)undefined, 10Correct answer is option 'D'. Can you explain this answer?.
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