From fce13afbf61791abd8afed331664745713db299a Mon Sep 17 00:00:00 2001
From: Shaun Dern <smdern@gmail.com>
Date: Mon, 30 May 2016 14:11:21 -0700
Subject: [PATCH] Add omitBy (#60)

---
 README.md           | 20 ++++++++++++++++++++
 lib/index.js        |  2 ++
 lib/omitBy.js       |  8 ++++++++
 test/omitBy-spec.js | 15 +++++++++++++++
 4 files changed, 45 insertions(+)
 create mode 100644 lib/omitBy.js
 create mode 100644 test/omitBy-spec.js

diff --git a/README.md b/README.md
index 38acec2..06ca60d 100644
--- a/README.md
+++ b/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).
diff --git a/lib/index.js b/lib/index.js
index 884ec28..5889166 100644
--- a/lib/index.js
+++ b/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;
diff --git a/lib/omitBy.js b/lib/omitBy.js
new file mode 100644
index 0000000..eccdec2
--- /dev/null
+++ b/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);
diff --git a/test/omitBy-spec.js b/test/omitBy-spec.js
new file mode 100644
index 0000000..abfb706
--- /dev/null
+++ b/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;
+  });
+});