Merge pull request #1 from ghoti143/add-unique

Add unique

Author: sa-

README.md

@@ -18,5 +18,9 @@ func main() {
     newArray = sf.Map(newArray, func(item int) int { return item * 3 })
     newArray = sf.Filter(newArray, func(item int) bool { return item%2 == 0 })
     fmt.Println(newArray)
+    
+    duplicates := []string{"cat", "dog", "bird", "cat"}
+    deduped := sf.Unique(duplicates)
+    fmt.Println(deduped)
 }
-```
+```

main.go

@@ -19,3 +19,15 @@ func Filter[T any](s []T, f func(T) bool) []T {
 	}
 	return r[:counter]
 }
+
+func Unique[T comparable](s []T) []T {
+    inResult := make(map[T]bool)
+    var result []T
+    for _, str := range s {
+        if _, ok := inResult[str]; !ok {
+            inResult[str] = true
+            result = append(result, str)
+        }
+    }
+    return result
+}