ternary op function (#29)

Co-authored-by: Ruidy <rnemausat@newstore.com>

Makefile

@@ -1,11 +1,12 @@
-TEST = "go test ./... -coverpkg=./... -coverprofile coverage.out -covermode=count; go tool cover -func coverage.out; rm coverage.out"
+TEST=go test ./...
+COVER=-coverpkg=./... -coverprofile cov.out -covermode=count; go tool cover -func cov.out; rm cov.out
 IMAGE=underscore
 
 build:
 	docker build -t $(IMAGE):latest .
 
 test: build
-	docker run --name $(IMAGE) --rm -i -t $(IMAGE) sh -c $(TEST)
+	docker run --name $(IMAGE) --rm -i -t $(IMAGE) sh -c "$(TEST) $(COVER)"
 
 scan:
 	trivy --cache-dir .trivycache/ image --exit-code 0  --no-progress --severity CRITICAL $(IMAGE)

ternary.go

@@ -0,0 +1,8 @@
+package underscore
+
+func Ternary[T any](condition bool, pos, neg T) T {
+	if condition {
+		return pos
+	}
+	return neg
+}

ternary_test.go

@@ -0,0 +1,23 @@
+package underscore_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	u "github.com/rjNemo/underscore"
+)
+
+func TestTernary(t *testing.T) {
+	tests := []struct {
+		condition bool
+		want      string
+	}{
+		{true, "foo"},
+		{false, "bar"},
+	}
+
+	for _, tc := range tests {
+		assert.Equal(t, u.Ternary(tc.condition, "foo", "bar"), tc.want)
+	}
+}