## TrendlineCollection class

Represents a collection of all the Trendline objects for the specified data series.

## Methods

| Name | Description |
| --- | --- |
| [add(type)](#add) | Adds a Trendline object to this collection with specified type. |
| [add(type, name)](#add-1) | Adds a Trendline object to this collection with specified type and name. |
| [add()](#add-2) | Reserved for internal use. |
| [clear()](#clear) |  |
| [contains()](#contains) | Reserved for internal use. |
| [get()](#get) | Gets a Trendline object by its index. |
| [get()](#get-1) | Reserved for internal use. |
| [getCount()](#getcount) |  |
| [indexOf()](#indexof) | Reserved for internal use. |
| [iterator()](#iterator) |  |
| [removeAt()](#removeat) |  |

### add(type) {#add}

Adds a Trendline object to this collection with specified type.

| Parameter | Type | Description |
| --- | --- | --- |
| type | Number | TrendlineType |

**Returns:** Number — `Number` Trendline object index.

### add(type, name) {#add-1}

Adds a Trendline object to this collection with specified type and name.

| Parameter | Type | Description |
| --- | --- | --- |
| type | Number | TrendlineType |
| name | String | Trendline name. |

**Returns:** Number — `Number` Trendline object index.

### add() {#add-2}

Reserved for internal use.

### clear() {#clear}

### contains() {#contains}

Reserved for internal use.

### get() {#get}

Gets a Trendline object by its index.

### get() {#get-1}

Reserved for internal use.

### getCount() {#getcount}

### indexOf() {#indexof}

Reserved for internal use.

### iterator() {#iterator}

### removeAt() {#removeat}