How do I map a sequence of objects to Maps in Scala?

Question

How do I map a sequence of class instances to a sequence of Maps in Scala?

Assume that the instances are of the following type:

class Package(_name: String, _description: String, _homepage: String = null) {
  var name: String = _name
  var description: String = _description
  var homepage: String = _homepage
}

And we have a sequence of instances of this type:

var packages = Seq(
  new Package("A", "Package A", "https://github.com/package/a"),
  new Package("B", "Package B")
)

How do I map packages to a sequence of Maps?

The Maps should be equivalent to the following:

Seq(
  ("name" -> "A", "description" -> "Package A", "homepage" -> "https://github.com/package/a"),
  ("name" -> "B", "description" -> "Package B", "homepage" -> null)
)

What do the maps look like?

Lee
– Lee

2014-01-28 21:30:39 +00:00
Commented Jan 28, 2014 at 21:30 — Lee
– Lee, Commented Jan 28, 2014 at 21:30

Lee · Accepted Answer · 2014-01-28 21:43:29Z

3

Based on your edit you can do:

packages.map(p => Map(("name", p.name), ("description", p.description), ("homepage", p.homepage)))

answered Jan 28, 2014 at 21:43

Lee

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Brian · Accepted Answer · 2014-01-28 21:35:07Z

1

To create a map of packages with name as the key and Package as the value this would do.

scala> packages.map(p => p.name -> p).toMap
res7: scala.collection.immutable.Map[String,Package] = Map(A -> Package@c3cec2e, B -> Package@73b5c648)

answered Jan 28, 2014 at 21:35

Brian

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