Kabeer Ahmed created TOREE-520:
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Summary: Invalid error - Unapplied methods are only converted to
functions when a function type is expected
Key: TOREE-520
URL: https://issues.apache.org/jira/browse/TOREE-520
Project: TOREE
Issue Type: Bug
Affects Versions: 0.3.0
Environment: Jupyter Notebook on Ubuntu 20.04
Reporter: Kabeer Ahmed
The below code results in an error when executed in Toree on Jupyter notebook.
Please note that the first time execution would proceed without issues but
subsequent executions by pressing ctrl+Enter will result in the error being
thrown.
+*Code*+
// polymorphic functions
def findFirst[A](as: List[A], p: A => Boolean): Int = \{
val listLength = as.length
@annotation.tailrec
def go(n: Int): Int = {
if (n >= listLength) -1
else if (p(as(n))) n
else go(n + 1)
}
go(0)
}
def passFun(x: Int): Boolean = x == 2
val l: List[Int] = List(1, 2, 3)
// println("The findFirst of function is: ")
println(s"Answer is: ${findFirst(l, passFun)}")
Error thrown when the same code is executed twice is below:
<console>:28: error: missing argument list for method findFirst Unapplied
methods are only converted to functions when a function type is expected. You
can make this conversion explicit by writing `findFirst _` or `findFirst(_,_)`
instead of `findFirst`. findFirst ^ lastException: Throwable = null findFirst:
[A](as: List[A], p: A => Boolean)Int passFun: (x: Int)Boolean
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