solution2.2.6.1 provided

[andreas-roehler]

No description provided.

[andreas-roehler]

False error?:

[error] /home/runner/work/sofp-solutions/sofp-solutions/chapter02/src/test/scala/sofp/unit/Solutions.scala:937:46: (A, A) does not take parameters
[error]   xs.map((x: (A, A)) => (b = b :+ (x: (A, A))(0) :+ (x: (A, A))(1)))
[error]  

[winitzki]

(x: (A, A))(0)

That's where the problem is. Remove the type annotation and you get (x)(0), which means to apply x to 0. Let me see how to fix that.

[winitzki]

The function for extracting the parts from the tuple are _1 and _2. The syntax x(0) will not work with tuples until Scala 3.

Also, the point of this exercise is to use flatMap or flatten for implementing fromPairs, instead of using var b and mutating b in a loop.

[andreas-roehler]

Okay, thanks. Should provide the alternative solutions too.

[winitzki]

Will you write a solution using flatMap or flatten in a different PR?

[andreas-roehler]

Would prefer that, as comments are easier to read then. But do, as it's convenient for you.