ngSwitch

NgSwitch is a directive in the Angular framework used for conditional rendering. It allows developers to display different parts of a template based on the value of a specific expression. The directive consists of three main components: ngSwitch, ngSwitchCase, and ngSwitchDefault.

The ngSwitch directive is applied to a parent element, and it takes an expression as its value. This expression is the central piece that determines which child elements will be rendered.

ngSwitchCase directives are applied to child elements within the ngSwitch parent. Each ngSwitchCase has a value that is compared to the value of the ngSwitch expression. If the values match, the content within that ngSwitchCase is rendered. Multiple ngSwitchCase directives can be used within a single ngSwitch.

The ngSwitchDefault directive is optional and is also applied to a child element. If none of the ngSwitchCase values match the ngSwitch expression, the content within the ngSwitchDefault directive will be rendered. It acts as a fallback mechanism.

Together, these directives provide a clean and efficient way to manage conditional views in an Angular application, avoiding the need for complex nested ngIf statements in many scenarios. The rendering is declarative, making the template easier to read and understand.