feat: add u.Unique{Strings,Ints,Interfaces} helpers

README.md

@@ -131,6 +131,15 @@ func TempfileWithContent(content []byte) (*os.File, func(), error)
     returned parameter is a cleanup function that closes and removes the temp
     file.
 
+func UniqueInterfaces(input []interface{}) []interface{}
+    UniqueInterfaces removes duplicate values from an interface slice.
+
+func UniqueInts(input []int) []int
+    UniqueInts removes duplicate values from an int slice.
+
+func UniqueStrings(input []string) []string
+    UniqueStrings removes duplicate values from a string slice.
+
 func Unzip(src string, dest string) ([]string, error)
     Unzip decompresses a zip archive, moving all files and folders within the
     zip file to an output directory. Based on

depaware.txt

@@ -18,14 +18,15 @@ moul.io/u dependencies: (generated by github.com/tailscale/depaware)
         hash                                                         from archive/zip+
         hash/crc32                                                   from archive/zip
         io                                                           from archive/zip+
-        io/ioutil                                                    from archive/zip+
+        io/fs                                                        from archive/zip+
+        io/ioutil                                                    from moul.io/u
         math                                                         from compress/flate+
         math/bits                                                    from compress/flate+
         os                                                           from archive/zip+
         os/exec                                                      from moul.io/u
         os/signal                                                    from moul.io/u
         os/user                                                      from moul.io/u
-        path                                                         from archive/zip
+        path                                                         from archive/zip+
         path/filepath                                                from io/ioutil+
         reflect                                                      from encoding/binary+
         sort                                                         from compress/flate+

slice.go

@@ -0,0 +1,40 @@
+package u
+
+// UniqueStrings removes duplicate values from a string slice.
+func UniqueStrings(input []string) []string {
+	keys := make(map[string]bool)
+	list := []string{}
+	for _, entry := range input {
+		if _, value := keys[entry]; !value {
+			keys[entry] = true
+			list = append(list, entry)
+		}
+	}
+	return list
+}
+
+// UniqueInts removes duplicate values from an int slice.
+func UniqueInts(input []int) []int {
+	keys := make(map[int]bool)
+	list := []int{}
+	for _, entry := range input {
+		if _, value := keys[entry]; !value {
+			keys[entry] = true
+			list = append(list, entry)
+		}
+	}
+	return list
+}
+
+// UniqueInterfaces removes duplicate values from an interface slice.
+func UniqueInterfaces(input []interface{}) []interface{} {
+	keys := make(map[interface{}]bool)
+	list := []interface{}{}
+	for _, entry := range input {
+		if _, value := keys[entry]; !value {
+			keys[entry] = true
+			list = append(list, entry)
+		}
+	}
+	return list
+}

slice_test.go

@@ -0,0 +1,22 @@
+package u_test
+
+import (
+	"fmt"
+
+	"moul.io/u"
+)
+
+func ExampleUniqueStrings() {
+	fmt.Println(u.UniqueStrings([]string{"foo", "bar", "foo", "baz", "foo", "bar", "foobar", "baz", "foobaz"}))
+	// Output: [foo bar baz foobar foobaz]
+}
+
+func ExampleUniqueInts() {
+	fmt.Println(u.UniqueInts([]int{13, 51, 36, 69, 92, 92, 42, 21, 36, 13, 51}))
+	// Output: [13 51 36 69 92 42 21]
+}
+
+func ExampleUniqueInterfaces() {
+	fmt.Println(u.UniqueInterfaces([]interface{}{13, "foo", "bar", 42, 13, 43, "baz"}))
+	// Output: [13 foo bar 42 43 baz]
+}