(1).Error handling, “try…catch”

(2).Cooding Style

(3).Comments

(4).Cross Browser

(5).Block Bindings

var a = 1let b  = 2const c = 3

(6).var Declarations and Hoisting

(7).Block-Level Declarations

(8).Block Binding in Loops

(9).Functions with Default Parameter Values

(10).Arrow Functions

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