add plain object check and omit helpers

src/helpers/is_plain_object.js

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+export default function (obj) {
+  return (typeof obj === 'object' && !Array.isArray(obj) && obj !== null);
+}

src/helpers/object_omit.js

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+import isPlainObject from './is_plain_object';
+
+export default function (obj, props) {
+  if (!isPlainObject(obj)) return obj;
+  if (!Array.isArray(props)) props = [props];
+
+  const newObj = Object.assign({}, obj);
+
+  props.forEach(prop => delete newObj[prop]);
+  return newObj;
+}

test/src/helpers/is_plain_object.js

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+import expect from 'expect.js';
+import isPlainObject from '../../../lib/helpers/is_plain_object';
+
+function validateItems(checks, pass) {
+  checks.forEach(check => {
+    expect(isPlainObject(check)).to.be(pass);
+  });
+}
+
+describe('isPlainObject', function () {
+  describe('non-object primitives', function () {
+    it('return false', function () {
+      const checks = [
+        100,
+        true,
+        'i am a string',
+        function noop() {},
+        null,
+      ];
+
+      validateItems(checks, false);
+    });
+  });
+
+  describe('arrays', function () {
+    it('return false', function () {
+      const checks = [
+        [],
+        [1,2,3],
+        ['just a string'],
+      ];
+
+      validateItems(checks, false);
+    });
+  });
+
+  describe('', function () {
+    it('return true', function () {
+      const checks = [
+        {},
+        {one:1},
+        {object:{with:{array:[]}}},
+      ];
+
+      validateItems(checks, true);
+    });
+  });
+});

test/src/helpers/omit.js

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+import expect from 'expect.js';
+import objectOmit from '../../../lib/helpers/object_omit';
+
+describe('object omit', function () {
+  let obj = {};
+
+  beforeEach(() => {
+    obj = {
+      one: 1,
+      two: 2,
+      three: 3,
+      arr: [1,2,3],
+      check: 'aw yeah',
+    };
+  });
+
+  it('omits a single property', function () {
+    const val = objectOmit(obj, 'one');
+
+    expect(val).to.eql({
+      two: 2,
+      three: 3,
+      arr: [1,2,3],
+      check: 'aw yeah',
+    });
+  });
+
+  it('omits multiple properties', function () {
+    const val = objectOmit(obj, ['three', 'check']);
+
+    expect(val).to.eql({
+      one: 1,
+      two: 2,
+      arr: [1,2,3],
+    });
+  });
+});