Use StringArrayable for BaseCommands

basecommands.go

@@ -1,26 +1,10 @@
 package cwl
 
-// BaseCommands ...
+// BaseCommands represents "baseCommand" of CWL CommandLineTool.
+// @see http://www.commonwl.org/v1.0/CommandLineTool.html#CommandLineTool
 type BaseCommands []string
 
 // New constructs "BaseCommands" struct.
 func (baseCommands BaseCommands) New(i interface{}) BaseCommands {
-	switch x := i.(type) {
-
-	case string:
-		dest := []string{}
-		dest = append(dest, x)
-		return dest
-	case []interface{}:
-		dest := make([]string, len(x))
-		for i, elm := range x {
-			str, ok := elm.(string)
-			if !ok {
-				return dest
-			}
-			dest[i] = str
-		}
-		return dest
-	}
-	return BaseCommands{}
+	return StringArrayable(i)
 }