The best practice is to pick either var or let, const. Mixing var, let and const together can lead to unexpected behavior.
var
let, const
var, let and const
var is function scoped, let, const are block scoped.
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The best practice is to pick either
var
orlet, const
. Mixingvar, let and const
together can lead to unexpected behavior.var
is function scoped,let, const
are block scoped.