---
id: 5d8a4cfbe6b6180ed9a1ca1d
title: Step 64
challengeType: 0
dashedName: step-64
---
# --description--
Next, chain the `enter()` function to the selection.
The enter function identifies elements that need to be added when the data array is longer than the selection array. This is why you wanted the `selectAll` to be an empty array before.
In this case, the `twitter-circles` selection has a length of 0, and the data array has a length of 9. So nine elements will be added when you use `append` in the next step.
# --hints--
test-text
```js
assert(/\.data\(data\)\s*\.enter\s*\(\s*\)/g.test(code));
```
# --seed--
## --before-user-code--
```html
D3 Dashboard
```
## --seed-contents--
```html
```
# --solutions--
```html
```