`var`, `let`, and `const` in JavaScript

Short summary

JavaScript offers three variable declaration methods: `var` (function-scoped, outdated), `let` (block-scoped, for changing values), and `const` (block-scoped, for immutable values). Modern JavaScript development strongly favors `let` and `const` for block scope and accident-prevention.

• •var is function-scoped and prone to bugs; avoid in modern code
• •let and const are block-scoped; let for changing values, const for immutable values
• •Hoisting differs: var initializes to undefined, let/const remain uninitialized (Temporal Dead Zone)

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