Modern JavaScript's `let` and `const` provide block scope, a significant improvement over traditional `var` declarations. Using these keywords correctly helps write more predictable code that's easier to debug. Best practices include using `const` whenever possible and avoiding `var` for new code.
Mastering block scope in JavaScript is crucial for efficient code. `let` and `const` introduced block scope, avoiding unexpected behavior and bugs. Key differences include `let` allowing reassignment and `const` not allowing it. Best practices: use `const` by default and avoid `var`.
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