add utils - unique,only

Author: prohazko2

index.d.ts

@@ -39,3 +39,8 @@ export declare function traverse<T>(tree: T & { children: T[] }): Traverse<T & {
 
 /* @file ./src/template.js */
 export declare function template<T>(template: string, context: T): any;
+
+
+/* @file ./src/filter.js */
+export declare function unique<T>(array: T[] = []): T[];
+export declare function only<T, K extends keyof T>(object: T, keys: K | K[] = []): Pick<T, K>;

index.js

@@ -15,6 +15,7 @@
  * limitations under the License.
  */
 
+const { unique, only } = require('./src/filter');
 
 module.exports = Object.assign({}, {
   node: require('./src/node'),
@@ -23,5 +24,7 @@ module.exports = Object.assign({}, {
   format: require('./src/format'),
   traverse: require('./src/traverse'),
   template: require('./src/template'),
-  log: require('./src/log')
+  log: require('./src/log'),
+  unique,
+  only
 });

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@rightech/utils",
-  "version": "0.1.13",
+  "version": "0.1.14",
   "description": "",
   "main": "index.js",
   "private": false,

src/filter.js

@@ -0,0 +1,18 @@
+function unique(array = []) {
+  return array.filter((item, pos, self) => {
+    return self.indexOf(item) === pos;
+  });
+}
+
+function only(object = {}, keys = []) {
+  keys = Array.isArray(keys) ? keys : [keys];
+  return keys.reduce((result, key) => {
+    result[key] = object[key];
+    return result;
+  }, {});
+}
+
+module.exports = {
+  unique,
+  only,
+};