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JavaScript Hoisting + Temporal Dead Zone made easy

  • JavaScript hoisting involves moving variable and function declarations to the top of their scope.
  • When using var, the variable is hoisted and initialized as undefined.
  • Variables declared with let and const are also hoisted but kept in the Temporal Dead Zone (TDZ).
  • TDZ is the time between when the scope starts and when the variable is declared, where you can't access the variable.
  • Function declarations are fully hoisted, allowing them to be called before declaration.
  • Function expressions like arrow functions follow TDZ rules and can cause errors if accessed before declaration.
  • Best practices include declaring variables at the top, using let and const over var, and structuring code to read top-down.
  • Using linters like ESLint can help catch TDZ bugs, and thinking of hoisting as JavaScript's pre-processing stage can aid in understanding behavior.
  • Understanding hoisting and TDZ can prevent unexpected errors and improve code quality in JavaScript.
  • Remembering the rules of hoisting and TDZ can make your code more predictable and easier to debug.

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