What does 'if $variable {}' mean in Puppet?

Question

If I have the following if statement in puppet:

if $variable {

   do something

}

What does this mean? Is it if $variable is true? If it exists? If it is defined?

Answer 1

Read the documentation.

“If” statements “If” statements take a boolean condition and an arbitrary block of Puppet code, and will only execute the block if the condition is true. They can optionally include elsif and else clauses.

https://docs.puppet.com/puppet/latest/reference/lang_conditional.html#if-statements