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Chris Camargo
Posted Oct 21 - Read on Facebook

I feel like I'm going crazy... This is a method I swear I've used in the past to check for the existence of a variable or a layer, but it's breaking. What am I doing wrong?

I was expecting the code simply NOT to print the second string. I wasn't expecting a ReferenceError.

Thoughts?

4 Comments

Struan Fraser

I think you just need to add a question mark after the layer names.

Struan Fraser

For reference it's called an existential operator. Very useful.

Chris Camargo

Wow... I don't think I've ever used that. I have no idea why I tripped over this today. Either way, thanks for clarifying Struan!

JL Flores Mena

TIL

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