JavaScript Variables Lifecycles

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

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What you'll 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

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