---
tags: ytt,research
---
# Scratchpad Notes: Hoisting Functions from YAML Templates
https://github.com/vmware-tanzu/carvel-ytt/issues/526
Cases:
- Case: Simplest
- Case: Guilt by Association
- Case: Ordinary Functions (i.e. not YAML Fragments functions)
## Case: Simplest
```yaml=
```
## Case: Guilt by Association
### Annotation Guilty by Association
```yaml=
a:
b: 1
#@overlay/replace via=lambda l,r: 42
#@ def foo():
b: 2
#@ end
#@overlay/match by=lambda i,l,r: True
---
a: #@ foo()
```
... without hoisting results in:
```yaml
a:
b: 42
```
... but the `@overlay/replace` is semantically _not_ part of `foo()`. Hoisting would result in:
```yaml=
#@ def foo():
b: 2
#@ end
---
a:
b: 1
#@overlay/replace via=lambda l,r: 42
#@overlay/match by=lambda i,l,r: True
---
a: #@ foo()
```
... which results in:
```yaml
42
```
### Code Guilty by Association
```yaml=
#@ x = 13
a:
b: 1
#@ x = 42
#@ def foo():
b: #@ x
#@ end
#@overlay/match by=lambda i,l,r: True
---
a: #@ foo()
```
## Case: Non-local variables within a function
```yaml=
a:
b: 1
#@ x = 42
#@ def foo():
b: #@ x
#@ end
#@overlay/match by=lambda i,l,r: True
---
#@ x = 13
a: #@ foo()
```
```yaml=
---
#@ def foo():
b: #@ x
#@ end
---
a:
b: 1
#@ x = 42
#@overlay/match by=lambda i,l,r: True
---
a: #@ foo()
#@ x = 13
```
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