8. Pattern Matching As Functions You can alsopass pattern matching as a parameter to other methods. Scala compiles a pattern match down to aPartialFunction[A,B], which is a subclass of Function1[A,B].So a pattern can be passed to any method that takes a single parameter function. This...
We have apowerfunction. The function has one argument with an implicit value. We can call the function with one or two arguments. def power(x: Int, n: Int = 2): Int = The second parameter of thepowerfunction is implicit. If it is not provided, its value is 2. $ scala main.scala...
So the issue is how can you pass a by-name-parameter to a method that takes a function as a parameter without having to do: 1. scala> def takesFunc(func: () => Int) = println(func()) 2. takesFunc: (() => Int)Unit 3. scala> def send(x: => Int) = takesFunc(() => x...
This example demonstrated how to pass an existing function as a parameter to a higher-order function. An alternative to using functions as parameters is to define them inline with function literals, as we will see in the next section.
Anorm parameter can be multi-value, like a sequence of string.In such case, values will be prepared to be passed to JDBC.// With default formatting (", " as separator) SQL("SELECT * FROM Test WHERE cat IN ({categories})"). on('categories -> Seq("a", "b", "c") // -> ...
You do this by including the form as a parameter to the view template. For user.scala.html, the header at the top of the page will look like this:@(userForm: Form[UserData])(implicit messages: Messages)Because user.scala.html needs a form passed in, you should pass the empty userForm...
•Scala has immutable “val” as a first class language feature. The “val” of scala is similar to Java final variables. Contents may mutate but top reference is immutable.•Scala lets ‘if blocks’, ‘for-yield loops’, and ‘code’ in brac es to return a value. It is more ...
A first pass at a sum function might be as follows:1 2 3 4 5 6 7 def sum(nums: Iterable[Int]): Int = { var sum = 0 for (num <- nums) { sum += num } sum }Note the declaration of sum as a var as opposed to a val; a val is equivalent to a final value while a ...
隐含转换适用于两种情况：@RequestMapping("/springmvc") @Controller public class SpringmvcTest { ...
The whole process is implemented in VoteIntentionTrainingTest as the test tuning a model and save it in $TunedModelPath and if executed should return the following optimal values: num trees: 25 max depth: 6 We could refine those results further and for each hyperparameter pass new candidates...