How to set default value in JavaScript’s Destructuring
Join Elixir newsletter
Subscribe to receive Elixir news to your inbox every two weeks.
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 }Related posts
Dive deeper into this topic with these related posts
You might also like
Discover more content from this category
Pattern-matching is one of the finest elixir-lang features. Whoever knows the power of this tool once, will want to use it forever.
If you ever had to count occurrences of values in Elixir's list, this short post might be helpful for you!
Each of us had a situation, where we had to invoke a few, same commands each time. Making it once is not that problematic, but when we are supposed to repeat given operations, it may be better just to create one function that will handle it all.