What will be logged to the console when the variable num is redeclared using var?

What will be logged to the console when the variable num is redeclared using var?

• A. 8
• B. 10
• C. SyntaxError
• D. ReferenceError

Answer: (B)

When a variable declared with `var` is redeclared, it does not produce a syntax error or a reference error. Instead, the variable is simply re-assigned to the new value provided in the redeclaration. The `var` keyword allows for the same variable to be declared multiple times within the same scope. If the variable `num` was initially assigned a value of 8 and then redeclared with the value of 10, the most recent assignment takes effect, so `num` would now hold the value 10. Consequently, when this variable is logged to the console, the output will display 10. Understanding the behavior of variable declarations in JavaScript is crucial, particularly the differences between `var`, `let`, and `const`, as `var` functions in a way that allows for the same identifier to be reused without generating errors.

When a variable declared with var is redeclared, it does not produce a syntax error or a reference error. Instead, the variable is simply re-assigned to the new value provided in the redeclaration. The var keyword allows for the same variable to be declared multiple times within the same scope.

If the variable num was initially assigned a value of 8 and then redeclared with the value of 10, the most recent assignment takes effect, so num would now hold the value 10. Consequently, when this variable is logged to the console, the output will display 10.

Understanding the behavior of variable declarations in JavaScript is crucial, particularly the differences between var, let, and const, as var functions in a way that allows for the same identifier to be reused without generating errors.