var, let, const
(1) don't use
varanymore, becauseletandconstare more specific
(2) default toconst, because it cannot be re-assigned or re-declared
(3) useletwhen re-assigning the variable (e.g. inforloop)
Sources:
Top comments (1)
(1) don't use var anymore, because let and const are more specific - Function-Level Scope
(2) default to const, because it cannot be re-assigned or re-declared - Block-Level Scope - JS engine easily optimize for const variables
(3) use let when re-assigning the variable (e.g. in for loop) - Block-Level Scope