CODEWITHSUNDEEP
scala
Kevin Meredith
Kevin Meredith

Reputation: 41909

Confusion over List#foldLeft Behavior

List#foldLeft, why is the following Scala 2.11.2 code:

scala> List(1,2,3).foldLeft(2) _ + _
res0: String => String = <function1>

returning a <function1>?

Additionally, why does the following result equal <function1>5?

scala> res0("5")
res2: String = <function1>5

Upvotes: 0

Views: 52

Answers (1)

Gangstead
Gangstead

Reputation: 4182

I think you've confused the compiler by trying to use infix notation (no parenthesis) and _ placeholders and it's trying to curry it into a function. This works for me:

scala> List(1,2,3).foldLeft(2) (_ + _)
res1: Int = 8

Upvotes: 4

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