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Binding Data to Variables

codefinity profile image Manav Misra ・1 min read

var, let, const

(1) don't use var anymore, because let and const are more specific
(2) default to const, because it cannot be re-assigned or re-declared
(3) use let when re-assigning the variable (e.g. in for loop)


Sources:

  1. Robin Wieurch

Discussion (1)

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ankurloriya profile image
Ankur Loriya

(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