The Modern JavaScript Bootcamp (2019) - Function Scope

The video tutorial explores JavaScript scopes, focusing on how functions create local scopes similar to if statements. It demonstrates this concept using a Fahrenheit to Celsius conversion function, highlighting the role of function arguments and nested scopes. The tutorial emphasizes that variables within a function are not accessible outside of it, and visualizes these concepts with a scope tree. The video concludes by reinforcing the understanding of function scopes and setting the stage for further programming exploration.

What is the main characteristic of lexical scoping in JavaScript?

• Variables are accessible only within the block they are defined.

• Variables are accessible globally regardless of where they are defined.

• Variables are accessible only within the function they are defined.

• Variables are accessible only within the file they are defined.

In JavaScript, what happens to variables defined within a function?

• They become global variables.

• They are accessible in the entire script.

• They are accessible in all functions.

• They are accessible only within that function.

What is included in the local scope of a function?

• Only variables defined within the function.

• Only the function arguments.

• Neither variables nor arguments.

• Both variables defined within the function and its arguments.

How does an if statement within a function affect scope?

• It does not affect the scope.

• It creates a new global scope.

• It merges with the global scope.

• It creates a new local scope within the function.

What can be accessed within an if block inside a function?

• Only variables defined within the if block.

• Only global variables.

• Variables from any scope.

• Variables from the parent scope and the if block.