JavaScript Variables Lifecycles

Understand JavaScript Engine phases and lifecycles of the "var", "let", "const". Scopes, hoisting, closures simplified.

Created by: Bogdan Stashchuk | 300K Students Worldwide | MBA, PhD
Programming, IT, DevOps, Security, Computer Networks Courses

What Will I Learn?

• Explain difference between global scope, function scope and block scope
• Understand how variables declared using "var" behave
• Explain difference between "let" and "const"
• Practice different variables declarations types
• Understand two JavaScript Engine Phases - "Compilation" and "Execution"
• Deeply understand variables lifecycle phases for variables declared using "var", "let" and "const"
• Explain lifecycle phases for the undeclared variables
• Understand lifecycle of the function
• Practice and understand most important variables usage guidelines

Requirements

• Basic JavaScript knowledge
• Fundamentals of CSS
• Basic understanding of HTML

Target audience

• JavaScript developers
• Front-end developers
• Full-stack developers