Block-scoped Declarations

    let and const

    We declare variables with let and constants with const.

    Avoid variable declarations with var unless maintaining legacy code

    Constants with mutable values

    With const, a name is permanently bound to a value in scope and can't be reassigned.

    However, if the value is an object, then the value is still mutable.

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    Arrow Functions
    Contents
    1. let and const
    2. Constants with mutable values

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