Add omitBy (#60)

README.md

@@ -395,6 +395,26 @@ var result = u({ user: u.omit(['authToken', 'SSN']) }, user);
 expect(result).to.eql({ user: { email: 'john@aol.com', username: 'john123' } });
 ```
 
+### `u.omitBy(predicate(, object))`
+
+Remove properties. See [`_.omitBy`](https://lodash.com/docs#omitBy).
+
+```js
+var user = {
+  user: {
+    email: 'john@aol.com',
+    username: 'john123',
+    authToken: '1211..',
+    SSN: 5551234
+  }
+};
+
+function isSensitive(value, key) { return key == 'SSN' }
+var result = u({ user: u.omitBy(isSensitive, user);
+
+expect(result).to.eql({ user: { email: 'john@aol.com', username: 'john123', authToken: '1211..' } });
+```
+
 ### `u.reject(predicate(, object))`
 
 Reject items from an array. See [`_.reject`](https://lodash.com/docs#reject).

lib/index.js

@@ -5,6 +5,7 @@ import _if from './if';
 import ifElse from './ifElse';
 import map from './map';
 import omit from './omit';
+import omitBy from './omitBy';
 import reject from './reject';
 import update from './update';
 import updateIn from './updateIn';
@@ -21,6 +22,7 @@ u.is = is;
 u.freeze = freeze;
 u.map = map;
 u.omit = omit;
+u.omitBy = omitBy;
 u.reject = reject;
 u.update = update;
 u.updateIn = updateIn;

lib/omitBy.js

@@ -0,0 +1,8 @@
+import _omitBy from 'lodash/omitBy';
+import wrap from './wrap';
+
+function omitBy(predicate, collection) {
+  return _omitBy(collection, predicate);
+}
+
+export default wrap(omitBy);

test/omitBy-spec.js

@@ -0,0 +1,15 @@
+import { expect } from 'chai';
+import u from '../lib';
+
+describe('u.omitBy', () => {
+  it('can omitBy with a function', () => {
+    const predicate = (value, key) => (value === 7 && key === 'bar');
+    const result = u({ foo: u.omitBy(predicate) }, { foo: { bar: 7, baz: 'a' } });
+
+    expect(result).to.eql({ foo: { baz: 'a' } });
+  });
+
+  it('freezes the result', () => {
+    expect(Object.isFrozen(u.omit('a', {}))).to.be.true;
+  });
+});