angular-cn/aio/content/cheatsheet/dependency-injection.md

@cheatsheetSection
Dependency injection configuration
@cheatsheetIndex 10
@description

@cheatsheetItem
syntax(ts):
`{ provide: MyService, useClass: MyMockService }`|`provide`|`useClass`
syntax(js):
`{ provide: MyService, useClass: MyMockService }`|`provide`|`useClass`
description:
Sets or overrides the provider for `MyService` to the `MyMockService` class.


@cheatsheetItem
syntax(ts):
`{ provide: MyService, useFactory: myFactory }`|`provide`|`useFactory`
syntax(js):
`{ provide: MyService, useFactory: myFactory }`|`provide`|`useFactory`
description:
Sets or overrides the provider for `MyService` to the `myFactory` factory function.


@cheatsheetItem
syntax(ts):
`{ provide: MyValue, useValue: 41 }`|`provide`|`useValue`
syntax(js):
`{ provide: MyValue, useValue: 41 }`|`provide`|`useValue`
description:
Sets or overrides the provider for `MyValue` to the value `41`.