for-comprehension

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Binding a single value within a for comprehension

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][详细]

2023-04-09 07:05 分类：问答
println in scala for-comprehension

In a for-comprehension, I can\'t just put a print statement: def prod (m: Int) = { for (a <- 2 to m/(2*3);[详细]

2023-04-04 14:00 分类：问答
Why does Scala choose the type 'Product' for 'for' expressions involving Either and value definitions

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[详细]

2023-04-01 22:12 分类：问答
Is it good style to nest for-comprehensions in Scala?

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]) = {[详细]

2023-03-30 13:59 分类：问答
for..else for Option types in Scala?

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[详细]

2023-03-24 18:39 分类：问答
Need the best way to iterate a file returning batches of lines as XML

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.[详细]

2023-03-07 17:25 分类：问答
Scala for-comprehension syntax

In the following code, inside the for comprehension, I can refer to the string and index using a tuple dereference:[详细]

2023-02-09 11:48 分类：问答
Composing Option with List in for-comprehension gives type mismatch depending on order

Why does this construction cause a Type Mismatch error in Scala? for (first <- Some(1); second <- List(1,2,3)) yield (first,second)[详细]

2023-02-05 00:47 分类：问答
Scala for comprehension efficiency?

In the book \"Programming In Scala\", chapter 23, the author give an example like: case class Book(title: String, authors: String*)[详细]

2023-01-26 04:17 分类：问答
How can I do 'if..else' inside a for-comprehension?

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:[详细]

2023-01-25 02:15 分类：问答