Added filterUndefined params to array rule

README.md

@@ -525,6 +525,18 @@ check({ roles: "user" }); // Valid
 // After both validation: roles = ["user"]
 ```
 
+**Example for `filterUndefined`:**
+
+```js
+const schema = {
+    roles: { type: "array", filterUndefined: true }
+}
+const check = v.compile(schema);
+
+check({ roles: ["user", undefined, "employer"] }); // Valid
+// After validation: roles = ["user", "employer"]
+```
+
 ### Properties
 Property | Default  | Description
 -------- | -------- | -----------
@@ -537,6 +549,7 @@ Property | Default  | Description
 `enum`	 | `null`   | Every element must be an element of the `enum` array.
 `items`	 | `null`   | Schema for array items.
 `convert`| `null`   | Wrap value into array if different type provided
+`filterUndefined`| `null`   | Filter undefined value in resulted array.
 
 ## `boolean`
 This is a `Boolean` validator.

lib/rules/array.js

@@ -84,9 +84,12 @@ module.exports = function ({ schema, messages }, path, context) {
 		`);
 	}
 
+	src.push(`
+		var arr = value;
+	`);
+
 	if (schema.items != null) {
 		src.push(`
-			var arr = value;
 			var parentField = field;
 			for (var i = 0; i < arr.length; i++) {
 				value = arr[i];
@@ -99,15 +102,18 @@ module.exports = function ({ schema, messages }, path, context) {
 		src.push(this.compileRule(rule, context, itemPath, innerSource, "arr[i]"));
 		src.push(`
 			}
-		`);
+		`);	
+	} 
+
+	if (schema.filterUndefined === true) {
 		src.push(`
+			arr = arr.filter(x => x !== undefined);
+		`);
+	}
+
+	src.push(`
 		return arr;
 	`);
-	} else {
-		src.push(`
-		return value;
-	`);
-	}
 
 	return {
 		sanitized,