# Reference

## Core

- [Defining grammars using objects](objectDefs.md)
- [Defining grammars using strings](stringDefs.md)
- [Whitespace handling](whitespace.md)
- [Skipping](skipping.md) junk within matches
- [Computed fields and validation functions](functions.md)
- [Provided matchers](providedMatchers.md)

## Advanced
- [Handling circular references](circularity.md) via lazy matchers
- Implementing [custom matchers](customMatchers.md)
- Maintaining [state](state.md) while matching
1. - [Troubleshooting](trouble.md) tips
- [Performance](performance.md) tips