How to set default value in JavaScript’s Destructuring

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

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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Szymon Soppa Web Developer
Szymon Soppa Curiosum Founder & CEO

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Phoenix LiveView Tutorial: Adding Phoenix PubSub and Pow Authentication to Messenger

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  • Elixir

5 top-tier companies that use Elixir

Elixir is a pretty capable language - and it consistently ranks near the top of most loved and wanted languages rankings. It has a large following and some very persuasive preachers as well. But that would not be enough to make me like it – what I need as real proof of its strengths is real businesses that strive with Elixir.

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