JavaScript Variables Lifecycles


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

What Will I Learn?

  • Explain the difference between global scope, function scope, and block scope
  • Understand how variables declared using “var” behave
  • Explain the 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 the lifecycle of the function
  • Practice and understand the most important variables usage guidelines


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

Description :

Do you want to understand the real difference between different types of variables in JavaScript?

In this course, I will dive deep into the JavaScript and explain to you what happens under the hood when you declare any variable or function. You will understand what happens on the “Compilation” and “Execution” phases in JavaScript Engine.

I will make explain to you what is the variable declaration, initialization, and assignment that are all-together called Variable Lifecycle Phases.

  • We will also focus in this course on the Variables Usage Guidelines:
  • Make Code clear and readable for others
  • Always declare variables before the first usage
  • Always use “use strict” globally
  • Don’t expose to the outer scopes local variable

Who is the target audience?

  • JavaScript developers
  • Front-end developers
  • Full-stack developers
Created By N/A
Last Updated 0/0000
Language English
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