> For the complete documentation index, see [llms.txt](https://odilbeks-organization.gitbook.io/untitled/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://odilbeks-organization.gitbook.io/untitled/frontend-features.md).

# Frontend features

### Equals

1. Angular \*ngIf & \[ngIf]

```
<ng-container *ngIf="expression;else template"></ng-container>
// Equals
<ng-template [ngIf]="expression" [ngIfElse]="template"></ng-template>

<ng-template #template></ng-template>
```

2. &#x20;\*ngFor & ngFor

```
// Some code
<ng-container *ngFor="let item of items"></ng-container>
<ng-template ngFor [ngForOf]="items" let-item></ng-template>
```

### Good code

1. Handle Input

```
// Some code

<input (input)="handleClick($event) />

// Bad code
handleInput(event: any) {
  console.log(event.target.value);
}

// Good code
handleInput(event: Event) {
  const { value } = event.target as HTMLInputElement;
  console.log(value);
}
```

2. Generic type

```
// Bad code
export interface UserRequest {
    ...
    role: number;
}
export interface UserResponse {
    ...
    role: Role;
}
export interface Role {
    ...
}

// Good code
export interface IUser<TRole> {
    ...
    role: TRole;
}
export interface UserRequest extends IUser<number> {
    ...
}
export interface UserResponse extends IUser<Role> {
    ...
}
export interface Role {
    ...
}
```

3. Destructuring

```
export interface Rectangle {
    x: number;
    y: number;
    height: number;
    weight: number;
}

const rect: Rectangle = { x: 0, y: 10, width: 15, height: 20 };

// Not Bad
console.log(rect.x, rect.y, rect.width, rect.height); // 0,10,15,20

// Better code with Destructuring assignment
var {x, y, width, height} = rect;
console.log(x, y, width, height); // 0,10,15,20

```

### Angular 16

1. inject

```
// Old style
constructor(private someService: SomeService) {
...
}

// New style
someService = inject(SomeService);
```

## Do you know?

1. Ng style

```
// Ng Style
[ngStyle]="{'font-size.px: 20}}"
```

2. Margin in Css

> When two margins are touching each other vertically, they are collapsed. When two margins touch horizontally, they do not collapse.


---

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