Understanding the Difference Between var, let, and const in JavaScript
JavaScript offers three ways to declare variables: var , let , and const . Each has its own rules, behavior, and use cases, impacting scope, redeclaration, initialization, and more. Knowing the distinctions among these keywords is essential for writing robust, clean, and error-free JavaScript code. This guide will explain the differences in terms of scope, declaration, redeclaration, initialization, and hoisting, with clear examples to illustrate each point. Scope: Where is the Variable Accessible? In JavaScript, scope defines where variables can be accessed within the code. JavaScript has three types of scope: Global Scope Function Scope Block Scope 1. Global Scope A variable has global scope if it’s declared outside any function or block. Global variables are accessible from any part of the code, including inside functions or blocks. var , let , and const can all have global scope if declared outside a function or block, but...
