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the identity function / published by https://github.com/dacr/code-examples-manager #c7cc3f50-abbe-40e8-a6dc-0182fef9d7fe/8971ff54b9871776cf82f70ecba695a50fdb1dcf
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// summary : the identity function | |
// keywords : scala, language-feature, fold, @testable | |
// publish : gist | |
// authors : David Crosson | |
// license : Apache NON-AI License Version 2.0 (https://raw.githubusercontent.com/non-ai-licenses/non-ai-licenses/main/NON-AI-APACHE2) | |
// id : c7cc3f50-abbe-40e8-a6dc-0182fef9d7fe | |
// created-on : 2021-04-06T07:46:48Z | |
// managed-by : https://github.com/dacr/code-examples-manager | |
// run-with : scala-cli $file | |
// --------------------- | |
//> using scala "3.1.1" | |
// --------------------- | |
val in1 = Option("B") | |
val out1 = in1.fold("A")(identity) | |
assert(out1 == "B") | |
val in2 = List(1,2,3) | |
val out2 = in2.map(identity) | |
assert(out2 == in2) | |
val in3 = List(1,2,2,3,4,4,4,4) | |
val out3 = in3.groupBy(identity).view.mapValues(_.size).toMap | |
assert(out3 == Map(1 -> 1, 2 -> 2, 3 -> 1, 4 -> 4)) |
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