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
varorlet, const. Mixingvar, let and consttogether can lead to unexpected behavior.varis function scoped,let, constare block scoped.