https://github.com/quii/learn-go-with-tests/blob/master/iteration.md#benchmarking

3 files changed, 10 insertions, 1 deletions

diff --git a/bin/benchmark b/bin/benchmark
new file mode 100755
index 0000000..e96fda5
--- /dev/null
+++ b/bin/benchmark
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+go test -bench=.
diff --git a/repeat.go b/repeat.go
index a873fbb..ed390f4 100644
--- a/repeat.go
+++ b/repeat.go
@@ -3,7 +3,7 @@ package main
 func Repeat(character string) string {
   var repeated string
   for i := 0; i < 5; i++ {
-    repeated = repeated + character
+    repeated += character
   }
   return repeated
 }
diff --git a/repeat_test.go b/repeat_test.go
index 37854a6..3ac6266 100644
--- a/repeat_test.go
+++ b/repeat_test.go
@@ -10,3 +10,9 @@ func TestRepeat(t *testing.T) {
     t.Errorf("expected %q but got %q", expected, repeated)
   }
 }
+
+func BenchmarkRepeat(b *testing.B) {
+  for i := 0; i < b.N; i++ {
+    Repeat("a")
+  }
+}