The Learn You a Haskell tutorial has an example of using a let binder in a list comprehension: calcBmis xs = [bmi | (w, h) <- xs, let bmi = w / h ^ 2, bmi >= 25.0]
In a for-comprehension, I can\'t just put a print statement: def prod (m: Int) = { for (a <- 2 to m/(2*3);
If I create a for comprehension with a value definition with Option, it works as expected: scala> for (a <- Some(4); b <- Some(5); val p = a * b) yield p
I just found myself writing a piece of code that looks like this: def language(frequencies: Array[String], text:开发者_运维百科 Array[String]) = {
Suppose I have two Options and, if both are Some, execute one code path, and if note, execute another.I\'d like to do something like开发者_如何学Python
I\'m looking for the best way to process a file in which, based on the contents, i combine certain lines into XML and return the XML.
In the following code, inside the for comprehension, I can refer to the string and index using a tuple dereference:
Why does this construction cause a Type Mismatch error in Scala? for (first <- Some(1); second <- List(1,2,3)) yield (first,second)
In the book \"Programming In Scala\", chapter 23, the author give an example like: case class Book(title: String, authors: String*)
I am asking a very basic question which confused me recently. I want to write a Scala For expression to do something like the following:
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