Answer & Solution
Answer: Option B
Solution:
The variable a inside the block will override the outer variable a due to var's function scope.
Q
What will be the output of the following code?
var a = 1; { var a = 2; } console.log(a);
Related Questions on Average
What will be the output of the following code?
let a = 1; let b = 2; let c = a + b; console.log(c);
A). 12
B). 12
C). 3
D). NaN
What will be the output of the following code?
console.log(a); var a = 10;
A). 10
B). undefined
C). Error
D). null
Which of the following is a valid variable name in JavaScript?
A). 2name
B). _name
C). #name
D).
Which keyword should be used to declare a block-scoped variable?
A). var
B). let
C). const
D). Both let and const
Which of the following is NOT a valid variable name in JavaScript?
A). myVar
B). $myVar
C). _myVar
D). 123myVar
What is hoisting in JavaScript?
A). Function call before declaration
B). Variable declared at the top
C). Variable and function declaration are moved to the top
D). Variable scope
Which keyword is used to declare a variable in JavaScript?
A). var
B). let
C). const
D). All of the above
Can variables declared with 'var' be redeclared in the same scope?
A). Yes
B). No
C). Only inside a function
D). Only inside a loop
What will be the output of the following code?
var x = 5; var y = 6; var z = x + y;
A). 11
B). 11
C). 5
D). 6
What will be the output of the following code?
const a = 10; a = 20; console.log(a);
A). 10
B). 20
C). Error
D). undefined