Modern JavaScript from the Beginning - Second Edition - Nested Scope

The video tutorial explains how scope works in programming, focusing on nested functions and blocks. It introduces the concept of closures and demonstrates how variables in parent scopes can be accessed by child functions, but not vice versa. The tutorial also covers similar principles in nested blocks using if statements, highlighting the importance of understanding scope for effective coding.

What is a key characteristic of variable scope in nested functions?

• Variables in a parent function can access variables from any function.

• Variables in a child function cannot access parent function variables.

• Variables in a parent function can access child function variables.

• Variables in a child function can access parent function variables.

In the example provided, what is the result of calling the nested function 'second'?

• It returns an error.

• It logs only the value of Y.

• It logs the sum of X and Y.

• It logs only the value of X.

Why can't the parent function access variables from the child function?

• Because the parent function is not defined.

• Because they are in separate scopes.

• Because the child function is private.

• Because the child function is not executed.

How does scope work in nested blocks like if statements?

• Variables in a parent block can access variables from any block.

• Variables in a child block can access parent block variables.

• Variables in a parent block can access child block variables.

• Variables in a child block cannot access parent block variables.

What happens if you try to access a variable from a nested if block outside of it?

• An error occurs because the variable is out of scope.

• The variable is ignored by the program.

• The variable is automatically declared in the parent block.

• The variable is accessible without any issues.