Add Inject function to iterable package.

Fix a couple of style mistakes.

R=r,rsc
APPROVED=r
DELTA=34  (30 added, 1 deleted, 3 changed)
OCL=27623
CL=27623

1 files changed, 10 insertions, 0 deletions

diff --git a/src/lib/container/iterable_test.go b/src/lib/container/iterable_test.go
index f266a955b..ceb1de6e4 100644
--- a/src/lib/container/iterable_test.go
+++ b/src/lib/container/iterable_test.go
@@ -42,6 +42,9 @@ func doubler(n interface {}) interface {} {
 func addOne(n interface {}) interface {} {
 	return n.(int) + 1
 }
+func adder(acc interface {}, n interface {}) interface {} {
+	return acc.(int) + n.(int)
+}
 
 // A stream of the natural numbers: 0, 1, 2, 3, ...
 type integerStream struct {}
@@ -107,6 +110,13 @@ func TestFind(t *testing.T) {
 	}
 }
 
+func TestInject(t *testing.T) {
+	res := Inject(oneToFive, 0, adder);
+	if res.(int) != 15 {
+		t.Errorf("Inject(oneToFive, 0, adder) = %v, want 15", res)
+	}
+}
+
 func TestMap(t *testing.T) {
 	res := Data(Map(Map(oneToFive, doubler), addOne));
 	assertArraysAreEqual(t, res, []int{ 3, 5, 7, 9, 11 })