## RevisionLogCollection class

Represents all revision logs.

```javascript
class RevisionLogCollection implements Iterable<RevisionLog>;
```


## Properties

| Property | Type | Description |
| --- | --- | --- |
| [daysPreservingHistory](#daysPreservingHistory--)| number | Gets and sets the number of days the spreadsheet application will keep the change history for this workbook. |

## Methods

| Method | Description |
| --- | --- |
| [get(number)](#get-number-)| Gets [RevisionLog](../revisionlog/) by index. |
| [getDaysPreservingHistory()](#getDaysPreservingHistory--)| <b>@deprecated.</b> Please use the 'daysPreservingHistory' property instead. Gets and sets the number of days the spreadsheet application will keep the change history for this workbook. |
| [setDaysPreservingHistory(number)](#setDaysPreservingHistory-number-)| <b>@deprecated.</b> Please use the 'daysPreservingHistory' property instead. Gets and sets the number of days the spreadsheet application will keep the change history for this workbook. |
| [highlightChanges(HighlightChangesOptions)](#highlightChanges-highlightchangesoptions-)| Highlights changes of shared workbook. |
| [getCount()](#getCount--)| <b>@deprecated.</b> Please use the 'count' property instead. Gets the number of elements contained in. |
| [isNull()](#isNull--)| Checks whether the implementation object is null. |

## \[Symbol.iterator\](): Iterator\<RevisionLog\>

Returns an iterator over the items in the collection. Enables use of `for...of`, spread syntax, and `Array.from()`.



### daysPreservingHistory {#daysPreservingHistory--}

Gets and sets the number of days the spreadsheet application will keep the change history for this workbook.

```javascript
daysPreservingHistory : number;
```


### get(number) {#get-number-}

Gets [RevisionLog](../revisionlog/) by index.

```javascript
get(index: number) : RevisionLog;
```

**Parameters:**
| Parameter | Type | Description |
| --- | --- | --- |
| index | number | The index. |

**Returns**

Returns [RevisionLog](../revisionlog/) object.

### getDaysPreservingHistory() {#getDaysPreservingHistory--}

<b>@deprecated.</b> Please use the 'daysPreservingHistory' property instead. Gets and sets the number of days the spreadsheet application will keep the change history for this workbook.

```javascript
getDaysPreservingHistory() : number;
```


### setDaysPreservingHistory(number) {#setDaysPreservingHistory-number-}

<b>@deprecated.</b> Please use the 'daysPreservingHistory' property instead. Gets and sets the number of days the spreadsheet application will keep the change history for this workbook.

```javascript
setDaysPreservingHistory(value: number) : void;
```

**Parameters:**
| Parameter | Type | Description |
| --- | --- | --- |
| value | number | The value to set. |

### highlightChanges(HighlightChangesOptions) {#highlightChanges-highlightchangesoptions-}

Highlights changes of shared workbook.

```javascript
highlightChanges(options: HighlightChangesOptions) : void;
```

**Parameters:**
| Parameter | Type | Description |
| --- | --- | --- |
| options | [HighlightChangesOptions](../highlightchangesoptions/) | Set the options for filtering which changes should be tracked. |

### getCount() {#getCount--}

<b>@deprecated.</b> Please use the 'count' property instead. Gets the number of elements contained in.

```javascript
getCount() : number;
```


### isNull() {#isNull--}

Checks whether the implementation object is null.

```javascript
isNull() : boolean;
```