Is there a way to test if a variable is set?

[bilogic]

Hi,

2 related questions:

1. How do I test if a is set like this host(...)->set("a", "value")? get("a") gives me null
2. Can I write {{ a ?? b }}, i.e. if a is null then use b instead?

Thank you.

[antonmedv]

Nice idea. Will add it. Right now there is a has() func. https://deployer.org/docs/7.x/api#has