# Structural Directives * Change the DOM layout by adding or removing DOM elements. ## Built-in Structural Directives

Directives	Details
`ngFor`	Repeat a node for each item in a list.
`ngIf`	Conditionally creates or disposes of subviews from the template.
`ngSwitch`	A set of directives that switch among alternative views.

### ngFor ```javascript

``` * repeating a component view ```javascript ``` ### ngIf * When `NgIf` is `false`, Angular removes an element and its descendants from the DOM. Angular then disposes of their components, which frees up memory and resources. ```javascript ``` * guarding against `null` ```javascript

Hello, {{currentCustomer.name}}

``` ### ngSwitch

Directives	Details
`ngSwitch`	An attribute directive that changes the behavior of its companion directives.
`ngSwitchCase`	Structural directive that adds its element to the DOM when its bound value equals the switch value and removes its bound value when it doesn't equal the switch value.
`ngSwitchDefault`	Structural directive that adds its element to the DOM when there is no selected `ngSwitchCase`.

```javascript

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