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+---
+title: functions, constructors and `this`
+tags:
+  - function
+  - this
+  - constructor
+order: 72
+date: Thu Oct 31 2019 23:44:19 GMT-0600 (Central Standard Time)
+answers:
+  - 'undefined // correct'
+  - 'Thinker Bell'
+  - '{ play: "Thinker Bell", sound: "la" }'
+  - NaN
+---
+
+
+Let's say you have a fancy defined constructor function `HellBells`.
+
+```javascript
+function HellBells(song) {
+    const sound = ‘la’
+    this = {
+       play: song,
+       sound,
+    };
+}
+
+```
+
+And then it comes octocat and tries to use the function as follows.
+```javascript
+console.log(HellBells(‘Thinker Bell’));
+
+```
+
+What is the output of that `console.log`?
+
+<!-- explanation -->
+
+This function has a little thing, that it has no `return`, which doesn't metter that much if you use it as a constructor ussing `new`, but unfortunatly ocotcat didn't do that.
+
+In order to have an output different of `undefined` he should do:
+
+```javascript
+console.log(new HellBells(‘Thinker Bell’));
+// {
+//  play: 'Thinker Bell',
+//   sound: 'la'
+// }
+```
+