#reactivity code explainers

typescript

import { Component, computed, DestroyRef, inject, input, output, signal } from '@angular/core';
import { takeUntilDestroyed } from '@angular/core/rxjs-interop';
import { interval, map, takeWhile } from 'rxjs';

How a signal-driven countdown works in Angular

signals reactivity rxjs

Intermediate 8 steps

typescript

import { Injectable, signal, computed, effect, inject } from '@angular/core';
import { DOCUMENT } from '@angular/common';
 
export type Theme = 'light' | 'dark';

A signal-based theme service in Angular

signals reactivity dependency-injection

Intermediate 7 steps

typescript

import { Injectable, computed, effect, signal } from '@angular/core';
 
export interface CartLine {
  id: string;

A signal-based cart store in Angular

signals reactivity computed-state

Intermediate 8 steps

typescript

import { Component, computed, signal } from '@angular/core';
import { CdkTableModule } from '@angular/cdk/table';
import { CdkScrollableModule } from '@angular/cdk/scrolling';

Paginating a CDK table with Angular signals

signals computed-state pagination

Intermediate 9 steps

typescript

import { Component, input, computed } from '@angular/core';
 
function toNumber(value: number | string): number {
  return typeof value === 'number' ? value : parseFloat(value);

Signal inputs and computed in Angular

signals reactivity derived-state

Intermediate 5 steps

typescript

import { Injectable, signal, computed } from '@angular/core';
 
export type ToastKind = 'success' | 'error' | 'info' | 'warning';

Building a signal-based toast service in Angular

signals state-management dependency-injection

Intermediate 8 steps

typescript

import { Injectable, computed, inject, signal } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { firstValueFrom } from 'rxjs';

Optimistic updates with Angular signals

signals optimistic-updates state-management

Intermediate 9 steps