Enclosed log evaluation is really nice and I'd have some trouble going back. It'... | Hacker News

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eropple on Sept 24, 2014 | parent | context | favorite | on: Logging can be tricky

Enclosed log evaluation is really nice and I'd have some trouble going back. It's older than Elixir, too; Commons.Logging in C# has supported it for a long time and most logging frameworks in Scala take a call-by-name parameter rather than an evaluated arg.

saryant on Sept 24, 2014 [–]

Example in Scala from Play:

https://github.com/playframework/playframework/blob/2.3.x/fr...

The '=>' means call-by-name in Scala, the argument is lazily evaluated.

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