CODEWITHSUNDEEP
scala
Tschösi
Tschösi

Reputation: 579

Scala collection map var to another value

I have a collection col with elements of type Foo.

Foo has a var bar, which I need to change for every element in the collection.

Currently my code looks like this

col.map(baz => {
  baz.bar = <something>
  baz
})

Is there a nicer way to do this? I feel like this could be done with a one liner.

Upvotes: 2

Views: 43

Answers (1)

Mario Galic
Mario Galic

Reputation: 48400

foreach is designed for side-effects like that

col.foreach(_.bar = <something>)

after this col will have all elements mutated. If you wish to avoid Unit return type try chaining

import util.chaining._
col.map(_.tap(_.bar = <something>))

or other way around

col.tap(_.foreach(_.bar = <something>))

Idimoatic approach would be to avoid var and have immutable case class Foo then copy

col.map(_.copy(bar = <something>))

Upvotes: 4

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