# I'm probably doing something wrong
**URL:** https://forum.makecode.com/t/im-probably-doing-something-wrong/2781
**Category:** Help
**Created:** [July 15, 2020, 1:24am UTC](https://forum.makecode.com/t/im-probably-doing-something-wrong/2781 "2020-07-15T01:24:10Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@jacob\_c](https://forum.makecode.com/u/jacob_c)
#### Post date: [July 15, 2020, 1:24am UTC](https://forum.makecode.com/t/im-probably-doing-something-wrong/2781/1 "2020-07-15T01:24:10Z")
In [this program](https://makecode.com/_5MJYwEW7EYKV), I have an array of images stored in a variable called `frames`. I wrote some code to manually update my sprite’s image in a `game.onUpdate` based on some tick counting.
In `onUpdate`, if I reference the array of images through closure, it seems to run fine.
However, if I attempt to read the array of images off of my sprite’s custom data\*, there’s a crash in the runtime.
I’m sure this represents a misunderstanding on my part, but I’d love some help understanding what I’m doing wrong. (cc @jwunderl)
\*comment out `65` and uncomment `68`
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### Author:  [@jwunderl](https://forum.makecode.com/u/jwunderl)
#### Post date: [July 15, 2020, 4:30am UTC](https://forum.makecode.com/t/im-probably-doing-something-wrong/2781/2 "2020-07-15T04:30:45Z")
Hmmm, weird. Looks like it’s not identifying it as an array properly if it’s stored in ‘any’. Giving a type hint fixes this: [https://makecode.com/\_KHv65WWkDFa6](https://makecode.com/_KHv65WWkDFa6)
@mmoskal is this expected / known behavior? I’m guessing just not identifying as an array vs an object literal?
Quick note, the data field is a [getter](https://github.com/microsoft/pxt-common-packages/blob/master/libs/game/sprite.ts#L161) so you should just be accessing as `mySprite.data` like you would `.x` and `.y`, without parens. I’m guessing this means we probably have wonky behavior if you have a getter returning a function, hmmm…
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### Author:  [@jacob\_c](https://forum.makecode.com/u/jacob_c)
#### Post date: [July 15, 2020, 4:56am UTC](https://forum.makecode.com/t/im-probably-doing-something-wrong/2781/3 "2020-07-15T04:56:29Z")
> [@jwunderl](#):
>
> the data field is a [getter](https://github.com/microsoft/pxt-common-packages/blob/master/libs/game/sprite.ts#L161)
… of course it is. Thanks.
I think that code was [inspired by code in the sprite data extension](https://github.com/microsoft/arcade-sprite-data/blob/master/main.ts#L11) which… ahem… also invokes `data` like a method.
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### Author:  [@peli](https://forum.makecode.com/u/peli)
#### Post date: [July 15, 2020, 7:15am UTC](https://forum.makecode.com/t/im-probably-doing-something-wrong/2781/4 "2020-07-15T07:15:27Z")
> [@jwunderl](#):
>
> the data field is a [getter](https://github.com/microsoft/pxt-common-packages/blob/master/libs/game/sprite.ts#L161) so
Oopsy fixed.
---
### Author:  [@mmoskal](https://forum.makecode.com/u/mmoskal)
#### Post date: [July 15, 2020, 10:34am UTC](https://forum.makecode.com/t/im-probably-doing-something-wrong/2781/5 "2020-07-15T10:34:28Z")
It works if you do it like this:
```auto
const animation = mySprite.data.animation as Image[]
```
In other words the compiler has to know that animation is an array.
I submitted [https://github.com/microsoft/pxt-arcade/issues/2161](https://github.com/microsoft/pxt-arcade/issues/2161) but I think this will be non-trivial to fix, so don’t hold your breath.
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### Author:  [@mmoskal](https://forum.makecode.com/u/mmoskal)
#### Post date: [July 15, 2020, 12:01pm UTC](https://forum.makecode.com/t/im-probably-doing-something-wrong/2781/6 "2020-07-15T12:01:40Z")
As for `.data()`, see [https://github.com/microsoft/pxt/pull/7317](https://github.com/microsoft/pxt/pull/7317)