score:8
Accepted answer
It's call-by-name parameter
http://ofps.oreilly.com/titles/9780596155957/FunctionalProgramming.html#_call_by_name_call_by_value
score:0
For anyone else who might stumble upon the same question:
It is called a by-name parameter and it is only evaluated if it is used in the function body.
This link explains the use of this notation in detail.
Also refer: Scala Documentation
Source: stackoverflow.com
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