Scala example source code file (byname.scala)

This example Scala source code file (byname.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Scala tags/keywords

a, a, app, app, assertionerror, int, int, int*, string, string, test

The Scala byname.scala source code

object Test extends App {

def test[A](name: String, expect: A, actual: => A) {
    if (expect != actual) throw new AssertionError("test " + name + " failed")
    else println("test " + name + " completed properly")
}

def testNoBraces = 1
test("no braces", 1, testNoBraces)

val testNoBracesR = testNoBraces _
test("no braces r", 1, testNoBracesR())

def testPlain(x: String, y: String): String = x + y
test("plain", "ab", testPlain("a", "b"))

val testPlainR = testPlain _
test("plain r", "cd", testPlainR("c", "d"))

def testOldByName(x: => Int) = x + 1
test("old by name", 3, testOldByName(1 + 1))

val testOldByNameR = testOldByName _
test("old by name r", 3, testOldByNameR(1 + 1))

val testOldByNameS: (=> Int) => Int = testOldByName _
test("old by name s", 3, testOldByNameS(2))

def testRegThenByName(x: Int, y: => Int): Int = x + y
test("reg then by name", 7, testRegThenByName(3, 2 * 2))

val testRegThenByNameS: (Int, =>Int) => Int = testRegThenByName _
test("reg then by name s", 8, testRegThenByNameS(2, 12 / 2))

def testVarargs(x: Int*) = x.reduceLeft((x: Int, y: Int) => x + y)
test("varargs", 4, testVarargs(1, 2, 1))

val testVarargsR = testVarargs _
test("varargs r", 4, testVarargsR(1, 2, 1))

def testAll(x: Int, y: => Int, z: Int*) = x + y + z.size
test("all", 5, testAll(1, 2, 22, 23))

val testAllR = testAll _
test("all r", 7, testAllR(2, 3, 34, 35))

val testAllS: (Int, =>Int, Int*) => Int = testAll _
test("all s", 8, testAllS(1, 5, 78, 89))

// test currying

def testC00()(): Int = 1
test("c00", 1, testC00()())

val testC00R = testC00 _
test("c00 r", 1, testC00R()())

val testC00RR = testC00() _
test("c00 rr", 1, testC00RR())


def testCBB(a: => Int)(b: => Int) = a + b
test("cbb", 3, testCBB(1)(2))

val testCBBR = testCBB _
test("cbb r", 5, testCBBR(1)(4))

val testCBBRR = testCBB(4) _
test("cbb rr", 6, testCBBRR(2))


def testCVV(a: Int*)(z: String, b: Int*) = a.size + b.size
test("cvv", 3, testCVV(1, 2)("", 8))

val testCVVR = testCVV _
test("cvv r", 3, testCVVR(1)("", 8, 9))

val testCVVRS: (String, Int*) => Int = testCVV(2, 3)
test("cvv rs", 4, testCVVRS("", 5, 6))

println("$")

// vim: set ts=4 sw=4 et:
}