JavaScript Variables & Execution Context Visualized in 2025

JavaScript Variables & Execution Context Visualized in 2025

For all serious JavaScript developers! Visualize advanced concepts related to VAR, LET, CONST and EXECUTON CONTEXT

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What you'll learn

• Understand variables VAR, LET, CONST at its fundamental and technical level
• Visualize the execution context and the call stack
• Understand the difference between immutable bindings vs immutable assignments
• Understand advanced concepts around variable block scoping, function objects and internal slots
• Understand variable hoisting, binding and memory allocation for VAR LET and CONST
• Learn why LET and CONST were introduced to replace VAR
• Master advanced variable concepts like environments, declarative records, components, slots, and more!
• Understand the Temporal Dead Zone (TDZ), and how to deal with it
• Compare JavaScript variable scopes to other languages like Golang, C, Java, Bash etc
• Be able to choose the appropriate keyword based on context
• Grasp memory management and bindings related to LET, CONST and VAR
• Understand the concept of variable reassignment and redeclaration
• Understand Lexical Scoping versus Dynamic Scoping
• Was VAR ever broken?
• Should you ever use VAR today (the answer may surprise you)
• And a whole bunch more!

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