Modern JavaScript from the Beginning - Second Edition - Declaration Versus Expression

The video tutorial explains the differences between function declarations and function expressions in JavaScript. It covers how to declare functions using the 'function' keyword and how to create function expressions by assigning functions to variables. The concept of hoisting is introduced, explaining how function declarations are available before code execution, unlike function expressions. Practical examples demonstrate these concepts, and recommendations for organizing code are provided.

What is the primary characteristic of a function declaration in JavaScript?

• It cannot be invoked before its definition.

• It starts with the keyword 'function'.

• It is assigned to a variable.

• It requires a semicolon at the end.

How does a function expression differ from a function declaration?

• It can be invoked before its definition.

• It does not require a semicolon at the end.

• It is assigned to a variable.

• It is not assigned to a variable.

What is the result of invoking a function expression before its definition?

• A syntax error occurs.

• The function executes normally.

• An uncaught reference error occurs.

• The function returns undefined.

What is hoisting in JavaScript?

• The process of moving all function and variable declarations to the top of the current scope.

• The ability to invoke functions before they are defined.

• The process of assigning functions to variables.

• The requirement to use semicolons at the end of expressions.

Which type of function can be invoked before its definition due to hoisting?

• Function declarations

• Arrow functions

• Anonymous functions

• Function expressions