如何将一系列类实例映射到Scala中的一系列地图?
假设实例属于以下类型:
class Package(_name: String, _description: String, _homepage: String = null) {
var name: String = _name
var description: String = _description
var homepage: String = _homepage
}
我们有一系列此类实例:
var packages = Seq(
new Package("A", "Package A", "https://github.com/package/a"),
new Package("B", "Package B")
)
如何将packages
映射到一系列地图?
地图应与以下内容相同:
Seq(
("name" -> "A", "description" -> "Package A", "homepage" -> "https://github.com/package/a"),
("name" -> "B", "description" -> "Package B", "homepage" -> null)
)
答案 0 :(得分:3)
根据您的编辑,您可以执行以下操作:
packages.map(p => Map(("name", p.name), ("description", p.description), ("homepage", p.homepage)))
答案 1 :(得分:1)
要创建packages
的地图,其中name
为关键字,Package
为此值。
scala> packages.map(p => p.name -> p).toMap
res7: scala.collection.immutable.Map[String,Package] = Map(A -> Package@c3cec2e, B -> Package@73b5c648)