Scala Language Partial Functions Usage to extract tuples in a map function
Example
These three map functions are equivalent, so use the variation that your team finds most readable.
val numberNames = Map(1 -> "One", 2 -> "Two", 3 -> "Three")
// 1. No extraction
numberNames.map(it => s"${it._1} is written ${it._2}" )
// 2. Extraction within a normal function
numberNames.map(it => {
val (number, name) = it
s"$number is written $name"
})
// 3. Extraction via a partial function (note the brackets in the parentheses)
numberNames.map({ case (number, name) => s"$number is written $name" })
The partial function must match all input: any case which doesn't match will throw an exception at runtime.
