JavaScript Tutorial
JavaScript Hoisting: Types, Uses, Examples
Table of Contents
- Introduction
- What is Hoisting in JavaScript?
- Types of Hoisting in JavaScript
- How Does Hoisting Work in JavaScript?
- Best Practices to Handle JavaScript Hoisting
- Common Mistakes with Hoisting in JavaScript
- Use of JavaScript Hoisting
FAQs Related to JavaScript Hoisting
Hoisting is a behavior in JavaScript where variable and function declarations are moved to the top of their scope during the compilation phase.
Both variable declarations (var, let, const) and function declarations are hoisted. However, var initializes to undefined, while let and const do not.
Yes, class declarations are hoisted, but accessing them before declaration results in a ReferenceError.
The TDZ is the time between the start of a block and the point where a let or const variable is declared. Accessing the variable in this zone throws a ReferenceError.
Only the variable declaration of a function expression is hoisted, not its assignment. This can lead to TypeError if accessed before initialization.
Use let and const for variable declarations, and always declare variables and functions at the start of their scope.
Understanding hoisting helps prevent bugs, improves code readability, and ensures predictable behavior in JavaScript programs.
