Scala how to get the last calculated stream value?

Question

According to scala, the docs stream implements lazy lists where items are evaluated only when they are needed. Example

val fibs: Stream[BigInt] = BigInt(0) #:: BigInt(1) #:: fibs.zip(fibs.tail).map(n => { 
    n._1 + n._2
})  

After that in scala repl;

fibs(4)
fibs

Will be printed;

res1: stream [BigInt] = stream (0, 1, 1, 2, 3 ,?)

Since calling .length or .last causes an infinite loop, how can I get the value "3" (the last calculated value) in the most efficient way?

Answer 1

. API Stream. , , Stream () Stream.