add cond/ternary operator

cond/ternary.go

@@ -0,0 +1,14 @@
+package cond
+
+// Ternary operator with a condition and two possible results.
+// The condition is evaluated and the first result is returned if it is true,
+// otherwise the second result is returned.
+//
+//	cond.Ternary(true, "yes", "no") // "yes"
+//	cond.Ternary(false, "yes", "no") // "no"
+func Ternary[T any](condition bool, ifTrue, ifFalse T) T {
+	if condition {
+		return ifTrue
+	}
+	return ifFalse
+}