How to set default value in JavaScript’s Destructuring

Did you know that it's possible to set default value in Javascript object destructuring?

Table of contents

    Let see how it works in action:

    > { firstName = "John" } = {}
    {}
    > firstName
    'John'

    One thing to keep in mind is that it only works with undefined values. It won't work with null, false and 0 as these are normal values.

    > { firstName = "John" } = { firstName: null }
    { firstName: null }
    > { firstName = "John" } = { firstName: 0 }
    { firstName: 0 }
    > {firstName = "John"} = { firstName: false }
    { firstName: false }
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