Merge pull request #222 from vaskoz/day105

Day105

README.md

@@ -114,3 +114,4 @@ problems from
 * [Day 102](https://github.com/vaskoz/dailycodingproblem-go/issues/214)
 * [Day 103](https://github.com/vaskoz/dailycodingproblem-go/issues/217)
 * [Day 104](https://github.com/vaskoz/dailycodingproblem-go/issues/219)
+* [Day 105](https://github.com/vaskoz/dailycodingproblem-go/issues/221)

day105/problem.go

@@ -0,0 +1,15 @@
+package day105
+
+import "time"
+
+// Debounced returns a debounced function that will not call its
+// provided function until after N milliseconds despite calling it.
+func Debounced(f func(), N int) func() {
+	created := time.Now()
+	return func() {
+		now := time.Now()
+		if elapsed := int(now.Sub(created) / time.Millisecond); elapsed > N {
+			f()
+		}
+	}
+}

day105/problem_test.go

@@ -0,0 +1,28 @@
+package day105
+
+import (
+	"testing"
+	"time"
+)
+
+func TestDebounced(t *testing.T) {
+	t.Parallel()
+	x := 0
+	f := func() {
+		x++
+	}
+	dbf := Debounced(f, 500)
+	for i := 0; i < 10; i++ {
+		dbf()
+	}
+	if x != 0 {
+		t.Errorf("Expected x not to change since it's debounced for 500ms")
+	}
+	time.Sleep(800 * time.Millisecond)
+	for i := 0; i < 10; i++ {
+		dbf()
+	}
+	if x != 10 {
+		t.Errorf("Expected x to be incremented 10 times")
+	}
+}