Source file is missing
package statement at the top 1import scala.io.Source 2import scala.collection.mutable 3import scala.collection.immutable 4 5class C { 6 override def finalize(): Unit = println("Finalize") 7} 8 9object Utils {10 def count(arr: Array[Int], criteria: Int => Boolean): Int = arr.filter(criteria).size11 def exists(arr: Array[Int], criteria: Int => Boolean): Boolean = arr.find(criteria).isDefined12 def filterBy(arr: Array[Int], criteria: Int => Boolean): Array[Int] = arr.filter(criteria)13 def filterBy(arr: Array[Int], first: Int => Boolean, `then`: Int => Boolean): Array[Int] =14 arr.filter(first).filter(`then`)1516 def pickBy(arr: Array[Int], criteria: Int => Boolean): Unit = {17 for (i <- 0 to arr.length - 1) {18 if (criteria(arr(i))) {19 println(s"Picked at $i")20 }21 }22 }2324 def pickFirst1(arr: Array[Int], criteria: Int => Boolean): Int = arr.filter(criteria).head25 def pickFirst2(arr: Array[Int], criteria: Int => Boolean): Option[Int] =26 arr.filter(criteria).headOption27 def pickInAnOrder(arr: Array[Int], criteria: Int => Boolean): Array[Int] =28 arr.sortWith(_ < _).filter(criteria)2930 def readFile(path: String): String = Source.fromFile(path).mkString3132 @Deprecated()33 def cmpArray1(arr1: Array[Int], arr2: Array[Int]): Boolean = arr1 == arr234 def stringifyArray(arr: Array[Int]): String = arr.toString35}3637object Main extends App {38 var filtered = Utils.filterBy(Range.inclusive(1, 100).toArray, criteria = x => x % 2 == 0)39 if (!filtered.isEmpty) {40 println(s"Found elements satisfying our criteria")41 }4243 var lang1 = "Scala"44 var lang2 = "scala"45 if (lang1.equals(lang2)) {46 var substr = lang2.substring(0, lang2.length - 1)47 }4849 lang1.foreach { c =>50 c match {51 case 'a' => println('a')52 case 'b' => println('b')53 case 'a' => println('a')54 }55 }5657 println(lang1.indexOf("a"))58 var sb = new mutable.StringBuilder('a')59}6061object BubbleSort {62 def bubbleSort(array: Array[Int]): Array[Int] = {63 breakable {64 for (_ <- array.indices) {65 var swap = false6667 for (j <- 0 to array.length - 2) {68 if (array(j) > array(j + 1)) {69 val temp = array(j)70 array(j) = array(j + 1)71 array(j + 1) = temp72 swap = true73 }74 }75 if (!swap) {76 break()77 }78 }79 }80 array81 }8283}
Description
This file is missing the package declaration. It is suggested that you utilize the concept of packages to ensure that your code is modular and is arranged in accordance with a well-defined convention. This approach makes it easy to navigate within a codebase, especially large and complex ones. The typical convention of arranging the source files is -
1. Root - /src/main/scala/com/org/project/
2. Test - /src/test/scala/com/org/project/
3. Packages -
a. /src/main/scala/com/org/project/Foo
b. /src/main/scala/com/org/project/Bar
You can however follow your own designated convention. If your codebase already uses packages, consider declaring them explicitly using the package keyword.
Bad practice
import scala.collection.mutable
import scala.util.{Try, Success, Failure}
// ...
Recommended
package com.org.project.Foo
import scala.collection.mutable
import scala.util.{Try, Success, Failure}
// ...