jagomf

import { Injectable } from '@angular/core';
import { Router, NavigationStart } from '@angular/router';
import { Observable } from 'rxjs';
import { Subject } from 'rxjs/Subject';

import { Alert, AlertType } from '../models/alert';

@Injectable()
export class AlertService {
	private subject = new Subject<Alert>();

jagomf

getResultFromRemote(): Subject<string> {
	const subs = new Subject<string>();
	this.http.get('http://localhost/service')
		.subscribe((res) => {
			subs.next(res);
		}, (err) => {
			subs.error(res);
		});
	return subs;
}

jagomf

...
import * as data from './example.json';

...

const word = (<any>data).name;
console.log(word); // output 'testing'

jagomf

const cloned = JSON.parse(JSON.stringify(original));

jagomf

returnObservable(): Observable<any> {
  return new Observable(observer => {
    if (/* whatever */) {
      return observer.next(body.data);
    } else {
      return observer.error(body.data);
    }

    return { unsubscribe() {} };
  });

jagomf

requestName(): Observable<Call> {
  return new Observable(observer => {
    const endpoint = 'endpoint';
    const data = {};

    // #region:multipart
    // In case of multipart
    const formData: FormData = new FormData();
    Object.keys(data).forEach((key) => {
      formData.append(key, data[key]);

jagomf

import { ActivatedRoute, Router, NavigationExtras } from '@angular/router';
...
const extras: NavigationExtras = {
	relativeTo: this.route,
	queryParams: { name: value },
	queryParamsHandling: 'merge'
};
this.router.navigate([], extras).then(() => { /* continue here */ });

jagomf

// Function with a promise

const doAsyncStuff = () => {
	return new Promise((resolve, reject) => {
		if (stuff) {
			resolve('cool');
		}
		reject('bad');
	});
};

jagomf

import 'dart:math' as math;

import 'package:flutter/foundation.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/widgets.dart';

/// Signature for a function that creates a [TileSize] for a given index.
typedef TileSize IndexedTileSizeBuilder(int index);

/// Creates grid layouts with a fixed number of spans in the cross axis.

jagomf

// More info on locales and codes for names on MDN 'toLocaleString'

weekdaysArray(locale = 'en-us', startMonday = false) {
  const initYear = 2006; // Year that started on the first day of week

  return Array.from({ length: 7 }, (v, k) => k)
    .map(weekday => new Date(initYear, 0, weekday + (startMonday ? 1 : 0) + 1)
    .toLocaleString(locale, { weekday: 'narrow' }));
}