profileStartX(sketch_group: SketchGroup) -> number
```
### Examples
```js
const sketch001 = startSketchOn('XY')
|> startProfileAt([5, 2], %)
|> angledLine([-26.6, 50], %)
|> angledLine([90, 50], %)
|> angledLineToX({ angle: 30, to: profileStartX(%) }, %)
```

```js
{
// The id of the sketch group.
id: uuid,
// What the sketch is on (can be a plane or a face).