Add Reach Into An Object For Nested Data With Get as a javascript til

README.md

@@ -10,7 +10,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 For a steady stream of TILs from a variety of rocketeers, checkout
 [til.hashrocket.com](https://til.hashrocket.com/).
 
-_659 TILs and counting..._
+_660 TILs and counting..._
 
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@@ -251,6 +251,7 @@ _659 TILs and counting..._
 - [Numbers Are Empty](javascript/numbers-are-empty.md)
 - [Object Initialization With Shorthand Property Names](javascript/object-initialization-with-shorthand-property-names.md)
 - [Random Cannot Be Seeded](javascript/random-cannot-be-seeded.md)
+- [Reach Into An Object For Nested Data With Get](javascript/reach-into-an-object-for-nested-data-with-get.md)
 - [Render An Array Of Elements With React 16](javascript/render-an-array-of-elements-with-react-16.md)
 - [Running ES6 Specs With Mocha](javascript/running-es6-specs-with-mocha.md)
 - [Scoping Variables With A Block Statement](javascript/scoping-variables-with-a-block-statement.md)

javascript/reach-into-an-object-for-nested-data-with-get.md

@@ -0,0 +1,35 @@
+# Reach Into An Object For Nested Data With Get
+
+Among the many [lodash](https://lodash.com/) utilities is
+[`_.get`](https://lodash.com/docs/4.17.5#get) for getting data from nested
+objects. You can specify where to reach into the nested data of an object
+using a _path_.
+
+Consider the following awkwardly nested object:
+
+```javascript
+const resp = {
+  error: {
+    errors: [
+      { message: "Something went wrong" },
+    ],
+  },
+};
+```
+
+Here is how we might reach into this with vanilla JavaScript:
+
+```javascript
+resp.error.errors[0].message;
+```
+
+Reaching into this for the `message` value is tricky because as soon as the
+`resp` object contains differently nested data, an error is likely to be
+thrown. We can simultaneously avoid a bunch of exception handling logic and
+provide a default value with the `_.get` function:
+
+```javascript
+_.get(resp, 'resp.error.errors[0].message', 'Default error message');
+```
+
+If we decide to not include a default value, then `undefined` will be used.