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Answer: 47 #1555

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40 changes: 13 additions & 27 deletions apps/typescript/47-enums-vs-union-types/src/app/app.component.ts
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Original file line number Diff line number Diff line change
@@ -1,25 +1,23 @@
import { Component, computed, signal } from '@angular/core';

enum Difficulty {
EASY = 'easy',
NORMAL = 'normal',
}
const Difficulty = {
EASY: 'easy',
NORMAL: 'normal',
} as const;
type Difficulty = (typeof Difficulty)[keyof typeof Difficulty];

enum Direction {
LEFT = 'left',
RIGHT = 'right',
}
type Direction = { [K in 'left' | 'right']: string };

@Component({
imports: [],
selector: 'app-root',
template: `
<section>
<div>
<button mat-stroked-button (click)="difficulty.set(Difficulty.EASY)">
<button mat-stroked-button (click)="difficulty.set('easy')">
Easy
</button>
<button mat-stroked-button (click)="difficulty.set(Difficulty.NORMAL)">
<button mat-stroked-button (click)="difficulty.set('normal')">
Normal
</button>
</div>
Expand All @@ -28,10 +26,8 @@ enum Direction {

<section>
<div>
<button mat-stroked-button (click)="direction.set(Direction.LEFT)">
Left
</button>
<button mat-stroked-button (click)="direction.set(Direction.RIGHT)">
<button mat-stroked-button (click)="direction.set('left')">Left</button>
<button mat-stroked-button (click)="direction.set('right')">
Right
</button>
</div>
Expand All @@ -55,11 +51,8 @@ enum Direction {
`,
})
export class AppComponent {
readonly Difficulty = Difficulty;
readonly difficulty = signal<Difficulty>(Difficulty.EASY);

readonly Direction = Direction;
readonly direction = signal<Direction | undefined>(undefined);
readonly direction = signal<keyof Direction | undefined>(undefined);

readonly difficultyLabel = computed<string>(() => {
switch (this.difficulty()) {
Expand All @@ -71,14 +64,7 @@ export class AppComponent {
});

readonly directionLabel = computed<string>(() => {
const prefix = 'You chose to go';
switch (this.direction()) {
case Direction.LEFT:
return `${prefix} ${Direction.LEFT}`;
case Direction.RIGHT:
return `${prefix} ${Direction.RIGHT}`;
default:
return 'Choose a direction!';
}
if (!this.direction()) return 'Choose a direction!';
return `You chose to go ${this.direction()}`;
});
}
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