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Re:Partial Application and Lambda Parameter Syntax for JavaS... by rmrfrmrf on Wednesday January 31, 2018 @07:57AM (#16273461)
> In Kotlin specifically, this is a shorthand for anonymous functions where, if you don’t specify an argument, one will automatically exist with the name it

I'm pretty sure Kotlin borrowed this idea from Groovy.

Re:Partial Application and Lambda Parameter Syntax for JavaS... by citycide on Wednesday January 31, 2018 @11:49AM (#16275225)
I'm pretty sure that's correct but Kotlin is a more recent reference so I chose it instead.