Binding Data to Variables

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)

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Sources:

1. Robin Wieurch

Comments

[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