## WebExtensionPropertyCollection class

Represents the list of web extension properties.

```javascript
class WebExtensionPropertyCollection implements Iterable<WebExtensionProperty>;
```


## Constructors

| Constructor | Description |
| --- | --- |
| [constructor()](#constructor--)| Default Constructor. |

## Methods

| Method | Description |
| --- | --- |
| [get(number)](#get-number-)| Gets the property of web extension by the index. |
| [get(string)](#get-string-)| Gets the property of web extension. |
| [add(string, string)](#add-string-string-)| Adds web extension property. |
| [removeAt(string)](#removeAt-string-)| Remove the property by the name. |
| [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\<WebExtensionProperty\>

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



### constructor() {#constructor--}

Default Constructor.

```javascript
constructor();
```


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

Gets the property of web extension by the index.

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

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

**Returns**

The property of web extension.

### get(string) {#get-string-}

Gets the property of web extension.

```javascript
get(name: string) : WebExtensionProperty;
```

**Parameters:**
| Parameter | Type | Description |
| --- | --- | --- |
| name | string | The name of property. |

**Returns**

The property of web extension.

### add(string, string) {#add-string-string-}

Adds web extension property.

```javascript
add(name: string, value: string) : number;
```

**Parameters:**
| Parameter | Type | Description |
| --- | --- | --- |
| name | string | The name of property. |
| value | string | The value of property. |

**Returns**

The index of added property.

### removeAt(string) {#removeAt-string-}

Remove the property by the name.

```javascript
removeAt(name: string) : void;
```

**Parameters:**
| Parameter | Type | Description |
| --- | --- | --- |
| name | string | The name of the property. |

### 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;
```