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avoid default arguments on groupBy() by having groupByTo() if the caller wishes to specify the Map to group into. Also tidied up the sample code in CollectionTest

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This commit is contained in:
James Strachan
2012-04-12 12:35:13 +01:00
parent 46dbd19433
commit c3f1e38c67
6 changed files with 49 additions and 41 deletions
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libraries/stdlib/test/CollectionTest.kt
+7 -27
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@@ -120,9 +120,9 @@ class CollectionTest {
}
}
// TODO would be nice to avoid the <String>
test fun filterIntoSet() {
val data = arrayList("foo", "bar")
// TODO would be nice to avoid the <String>
val foo = data.filterTo(hashSet<String>()){it.startsWith("f")}
assertTrue {
@@ -136,9 +136,9 @@ class CollectionTest {
}
}
// TODO would be nice to avoid the <String>
test fun filterIntoSortedSet() {
val data = arrayList("foo", "bar")
// TODO would be nice to avoid the <String>
val sorted = data.filterTo(sortedSet<String>()){it.length == 3}
assertEquals(2, sorted.size)
assertEquals(sortedSet("bar", "foo"), sorted)
@@ -176,59 +176,39 @@ class CollectionTest {
assertEquals(6, count)
}
/*
// TODO would be nice to be able to write this as this
//numbers.fold(0){it + it2}
numbers.fold(0){(it, it2) -> it + it2}
// TODO would be nice to be able to write this as this
// numbers.map{it.toString()}.fold(""){it + it2}
numbers.map<Int, String>{it.toString()}.fold(""){(it, it2) -> it + it2}
*/
test fun fold() {
// lets calculate the sum of some numbers
expect(10) {
val numbers = arrayList(1, 2, 3, 4)
numbers.fold(0){(it, it2) -> it + it2}
numbers.fold(0){ a, b -> a + b}
}
expect(0) {
val numbers = arrayList<Int>()
numbers.fold(0){(it, it2) -> it + it2}
numbers.fold(0){ a, b -> a + b}
}
// lets concatenate some strings
expect("1234") {
val numbers = arrayList(1, 2, 3, 4)
numbers.map<Int, String>{it.toString()}.fold(""){(it, it2) -> it + it2}
numbers.map<Int, String>{it.toString()}.fold(""){ a, b -> a + b}
}
}
/*
// TODO would be nice to be able to write this as this
// numbers.map{it.toString()}.foldRight(""){it + it2}
numbers.map<Int, String>{it.toString()}.foldRight(""){(it, it2) -> it + it2}
*/
test fun foldRight() {
expect("4321") {
val numbers = arrayList(1, 2, 3, 4)
numbers.map<Int, String>{it.toString()}.foldRight(""){(it, it2) -> it + it2}
numbers.map<Int, String>{it.toString()}.foldRight(""){ a, b -> a + b}
}
}
/*
TODO inference engine should not need this type info?
val byLength = words.groupBy<String, Int>{it.length}
*/
test fun groupBy() {
val words = arrayList("a", "ab", "abc", "def", "abcd")
val byLength = words.groupBy<String, Int>{it.length}
val byLength = words.groupBy{ it.length }
assertEquals(4, byLength.size())
val l3 = byLength.getOrElse(3, {ArrayList<String>()})
assertEquals(2, l3.size)
}
test fun makeString() {