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[`Editor`](Editor) › [`processLines`](Editor/processLines)
## Editor.processLines() method
0.13.26
**Signature:**
```typescript
processLines<T>(read: (line: number, lineText: string) => T | null, write: (line: number, lineText: string, value: T | null) => EditorChange | void, ignoreEmpty?: boolean): void;
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| <code>read</code> | <code>(line: number, lineText: string) => T | null</code> | |
| <code>write</code> | <code>(line: number, lineText: string, value: T | null) => </code>[`EditorChange`](EditorChange)<code> | void</code> | |
| <code>ignoreEmpty</code> | <code>boolean</code> | _(Optional)_ |
**Returns:**
`void`