• Scope:
  • var: Function-scoped, not block-scoped.
  • let: Block-scoped.
• Hoisting:
  • var: Hoisted and initialized with undefined.
  • let: Hoisted but not initialized (temporal dead zone).
• Re-declaration:
  • var: Allows re-declaration within the same scope.
  • let: Does not allow re-declaration within the same scope.
• Global Object Property:
  • var: Becomes a property of the global object.
  • let: Does not become a property of the global object.

Using let over var is generally recommended in modern JavaScript due to its block-scoped nature and reduced risk of unintended variable re-declarations or hoisting issues.

let

var

Examples and Comparison