Rename deepGetter to deepGet

test/deepGet.test.js

@@ -0,0 +1,40 @@
+const expect = require('expect');
+const {deepGet} = require('./_30s.js');
+
+let idx = 2
+const data = {
+  level1: {
+    level2: {
+      level3: 'level3',
+      level3a: true,
+      level3b: [1, 2, 3, { level3c: 'level3c' }, 4, 5],
+      level3d: {
+        level4: [{ foo: 'foo' }, { bar: 'bar' }, { baz: 'baz' }]
+      }
+    }
+  }
+};
+
+test('deepGet is a Function', () => {
+  expect(deepGet).toBeInstanceOf(Function);
+});
+
+test('deepGet target success', () => {
+  expect(deepGet(data, ['level1', 'level2', 'level3'])).toEqual('level3');
+});
+
+test('deepGet target and return null', () => {
+  expect(deepGet(data, ['level1', 'level2', 'foo', 'baz'])).toEqual(null);
+});
+
+test('deepGet target in an array', () => {
+  expect(deepGet(data, ['level1', 'level2', 'level3d', 'level4', 2, 'baz'])).toEqual('baz');
+});
+
+test('deepGet target with variable key', () => {
+  expect(deepGet(data, ['level1', 'level2', 'level3b', idx])).toEqual(3);
+});
+
+test('deepGet target with empty Object', () => {
+  expect(deepGet({}, ['foo', 'bar', idx, 'foo'])).toEqual(null);
+});