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1. Create project

npm i -g @nestjs/cli
nest new tasks-api
npm run start:dev

2. Overview and delete files

3. Create module

nest g mo tasks

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const data = [1,3,4,5];
const rta = data.reduce((counter, item) => counter + item, 0);
console.log(rta);

const orders = [
  {
    customerName: 'Nicolas',
    total: 60,
    delivered: true,
  },

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const orders = [
  {
    customerName: 'Nicolas',
    total: 60,
    delivered: true,
  },
  {
    customerName: 'Zulema',
    total: 120,
    delivered: false,

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.github/workflows/lighthouse-ci.yml

```yml
name: Lighthouse CI
on: [push]
jobs:
  lhci:
    name: Lighthouse CI
    runs-on: ubuntu-latest
    steps:

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const numbers = [1,2,3,4];
// Mutable
for (let index = 0; index < numbers.length; index++) {
  numbers[index] = numbers[index] + 2;
}
console.log(numbers);

// Inmutable v1
const newNumbers = [];
for (let index = 0; index < numbers.length; index++) {

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1. Install the Lighthouse CI CLI.

npm install -g @lhci/cli

2.

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import { Component, OnInit, forwardRef } from '@angular/core';
import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms';

@Component({
  selector: 'app-stepper',
  templateUrl: './stepper.component.html',
  styleUrls: ['./stepper.component.scss'],
  providers: [
    {
      provide: NG_VALUE_ACCESSOR,

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1. Define marker

interface Marker {
  lat: number;
  lng: number;
  title: string;
  image: string;
  text: string;
  markerObj?: any;

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npm install --save @nestjs/typeorm typeorm pg

import { Module } from '@nestjs/common';
import { TypeOrmModule } from '@nestjs/typeorm';
import { AppController } from './app.controller';
import { AppService } from './app.service';
import { configService } from './config/config.service';

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Arrays

Why?

const averageTempJan = 31.9;
const averageTempJan = 35.3;
const averageTempMar = 42.4;
const averageTempApr = 52;