Collection and files functions

Author: denis256

xcollection/xcollection.go

@@ -0,0 +1,10 @@
+package xcollection
+
+// StringBoolMapKeys - extract map keys as slice
+func StringBoolMapKeys(m map[string]bool) []string {
+	keys := make([]string, 0, len(m))
+	for kk := range m {
+		keys = append(keys, kk)
+	}
+	return keys
+}

xcollection/xcollection_test.go

@@ -0,0 +1,16 @@
+package xcollection
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestStringExtractions(t *testing.T) {
+
+	keys := StringBoolMapKeys(map[string]bool{
+		"qwe": true,
+		"123": true,
+	})
+
+	assert.Equal(t, 2, len(keys))
+}

xfiles/xfiles.go

@@ -0,0 +1,30 @@
+package xfiles
+
+import (
+	"bufio"
+	"github.com/unidev-platform/golang-core/xcollection"
+	"os"
+	"strings"
+)
+
+// ReadDistinctFileLines - Read text file lines as slice without empty and duplicates
+func ReadDistinctFileLines(path string)([]string, error) {
+	var linesMap map[string]bool
+
+	file, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		line := strings.TrimSpace(scanner.Text())
+		if len(line) > 0 {
+			linesMap[line] = true
+		}
+	}
+
+	return xcollection.StringBoolMapKeys(linesMap), scanner.Err()
+
+}