Answer
- var: function-scoped, redeclarable, hoisted with undefined.
- let: block-scoped, cannot redeclare in same scope, hoisted but uninitialized.
- const: block-scoped, cannot reassign, must initialize.
Quick Answer
var is function-scoped and hoisted — can be redeclared, accessible before declaration (as undefined). let is block-scoped, not hoisted in a usable way, can be reassigned but not redeclared. const is block-scoped, can't be reassigned. Prefer const by default, use let when you need to reassign, avoid var in modern code.
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
Want to bookmark, take notes, or join discussions?
Sign in to access all features and personalize your learning experience.
Source: SugharaIQ