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I stumble upon scala code like this: 

var folderName: String = _

What does the = _ do? And is there a proper name for this language feature?

Yuchen
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  • Click [here](https://stackoverflow.com/questions/8000903/what-are-all-the-uses-of-an-underscore-in-scala) and search for "default". – jwvh Apr 16 '18 at 02:04

1 Answers1

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= _ is used to set the default value when initialising a variable.

  1. var s: String = _ will set s equal to null.
  2. var i: Int = _ will set i equal to 0.
Matt Doyle
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