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What will be the output of the following JavaScript code?
var a=5 , b=1
var obj = { a : 10 }
// with keyword in JavaScript
with(obj)
{
alert(b)
}
var obj = { a : 10 }
// with keyword in JavaScript
with(obj)
{
alert(b)
}
- a)1
- b)10
- c)5
- d)Error
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
What will be the output of the following JavaScript code?var a=5 , b=1...
Answer:
The output of the given code will be "b) 10".
Explanation:
The code snippet provided has three variables defined: "a" with a value of 5, "b" with a value of 1, and "obj" which is an object with a property "a" with a value of 10.
The "with" statement in JavaScript is used to simplify accessing properties of an object by reducing the need to repeat the object name. It sets the specified object as the default object for the code block that follows.
In the given code, the "with" statement is used with the object "obj". Inside the code block, the "alert(b)" statement is executed.
Now let's analyze the code block:
1. The "with" statement sets the default object as "obj".
2. Inside the code block, when "alert(b)" is executed, it tries to access the value of "b".
3. Since "b" is not defined as a property of the object "obj", it looks for the variable "b" in the outer scope, which has a value of 1.
The reason behind this behavior is that the "with" statement creates a new scope, but it does not create new variables within that scope. It only provides a shortcut for accessing properties of an object.
So, when the code block is executed, the value of "b" is accessed from the outer scope and the output will be "1".
However, it is important to note that the use of the "with" statement is generally discouraged due to its potential for creating confusion and introducing bugs. It can make code harder to understand and maintain, as it is not clear where variables are coming from. It also has performance implications. Therefore, it is recommended to avoid using the "with" statement in JavaScript.
The output of the given code will be "b) 10".
Explanation:
The code snippet provided has three variables defined: "a" with a value of 5, "b" with a value of 1, and "obj" which is an object with a property "a" with a value of 10.
The "with" statement in JavaScript is used to simplify accessing properties of an object by reducing the need to repeat the object name. It sets the specified object as the default object for the code block that follows.
In the given code, the "with" statement is used with the object "obj". Inside the code block, the "alert(b)" statement is executed.
Now let's analyze the code block:
1. The "with" statement sets the default object as "obj".
2. Inside the code block, when "alert(b)" is executed, it tries to access the value of "b".
3. Since "b" is not defined as a property of the object "obj", it looks for the variable "b" in the outer scope, which has a value of 1.
The reason behind this behavior is that the "with" statement creates a new scope, but it does not create new variables within that scope. It only provides a shortcut for accessing properties of an object.
So, when the code block is executed, the value of "b" is accessed from the outer scope and the output will be "1".
However, it is important to note that the use of the "with" statement is generally discouraged due to its potential for creating confusion and introducing bugs. It can make code harder to understand and maintain, as it is not clear where variables are coming from. It also has performance implications. Therefore, it is recommended to avoid using the "with" statement in JavaScript.
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Community Answer
What will be the output of the following JavaScript code?var a=5 , b=1...
Firstly the interpreter checks obj for property b. But it doesn’t find any property b so it takes the value from outside the object within the JavaScript code snippet.
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