Return a Default Value with Promises Using catch

By  on  

Last week I tweeted all of you looking for your best JavaScript Array and Promise tricks, and as always, it didn't disappoint -- I learned quite a bit!

Today's JavaScript Promise trick is brought to you by Claudio Semeraro: how to use catch to set a default value instead of a try/catch:

// Instead of wrapping this block in a try/catch...
const result = await new Promise(
  (resolve, reject) => reject("Because Stone Cold said so")
)
// ...use catch to set the default value (100)
.catch(() => 100);

As a trick I really like what's this brings; as far as readability and maintenance, if you don't know the trick, you might get confused. What do you think?

Recent Features

Incredible Demos

  • By
    Advanced CSS Printing – Using JavaScript Double-Click To Remove Unwanted DIVs

    Like any good programmer, I'm constantly searching around the internet for ideas and articles that can help me improve my code. There are thousands of talented programmers out there so I stumble upon some great articles and code snippets that I like to print out...

  • By
    MooTools TextOverlap Plugin

    Developers everywhere seem to be looking for different ways to make use of JavaScript libraries. Some creations are extremely practical, others aren't. This one may be more on the "aren't" side but used correctly, my TextOverlap plugin could add another interesting design element...

Discussion

    Wrap your code in <pre class="{language}"></pre> tags, link to a GitHub gist, JSFiddle fiddle, or CodePen pen to embed!