Israel Oliveira raloliver

List of many websites where you can practice and exercise javascript (mainly to solve problems of real life ou practice willfully)

LESSON 1 (word doubt)

Say: i have a question (dont say i have a doubt)

Look at the sun. It beautiful today... I doubt that will rain. I doubt i get the job. My interview its terrible.

doubts like a have doubts

I having doubts. I dont think I should get married. The Smith family is having doubts about selling their house. If you have any questions, let me know.

	//AsyncSubject: exibe apenas o último valor enviado antes da função “completed()” ser executada.
	var subjectAsync = new Rx.AsyncSubject();
	var subscriptionAsync = subject.subscribe(
	value => console.log(`My Value is ${value}`),
	err => console.log(`Error message: ${err}`),
	() => console.log('Completed!')
	)

	var counterAsync = 5,
	intervalAsync = setInterval(()=>{

	var subjectAsync = new Rx.AsyncSubject();
	var subscriptionAsync = subject.subscribe(
	value => console.log(`My Value is ${value}`),
	err => console.log(`Error message: ${err}`),
	() => console.log('Completed!')
	)

	var counterAsync = 5,
	interval = setInterval(()=>{
	subject.next(counter--);

	//altera a estrutura da entrada e transforma numa outra estrutura
	var itemsMap = [{a: 1}, {a: 2}, {a: 3}, {a: 4},];
	var sourceMap = Rx.Observable.from(items);
	var subscriptionMap = source.map(x => { return {value: x.a} } ).subscribe(x => console.log(x));

	//apenas os números pares retornam
	var sourceFilter = Rx.Observable.from([1,2,3,4,5,6,7,8,9,10]);
	var subscriptionFilter = source.filter(x => x % 2 === 0 ).subscribe(x => console.log(x));

	//apenas um determinado número de elementos

	//5 segundos após a inscrição
	var sourceHoldOn = Rx.Observable.from([1,2,3,4,5]).delay(5000);
	var subscriptionHoldOn = source.subscribe(
	value => console.log(value)
	);

	//utilize o método take() para limitar quantos deseja receber
	var sourceInterval = Rx.Observable.interval(1000)
	var subscriptionInterval = source.subscribe(
	value => console.log(value)

	var sourceCountEach = Rx.Observable.range(0, 10).count()
	var subscriptionCountEach = source.subscribe(
	value => console.log(value)
	)

	var sourceCountOdd = Rx.Observable.range(0, 10).count(x => x % 2 === 0)
	var subscriptionCountOdd = source.subscribe(
	value => console.log(value)
	)

	var observable = Rx.Observable.create(observer => {
	observer.next(5);
	})

	observable.subscribe(
	value => console.log(`My Value is ${value}`)
	)

	/Programação Imperativa/
	var list = [1,2,3,4,5,6];
	var pares = [];
	for(var i = 0; i < list.length; i++){
	if(list[i] % 2 === 0){
	pares.push(list[i]);
	}
	}

	/* Programação Funcional */

	class RoteiroBloc {

	final _controller = StreamController();
	// Criando a Stream para retornar para quem chamou
	get stream => _controller.stream;

	// Método para consultar os roteiros da cidade.
	getRoteiros(){
	Future future = Roteiro.getRoteiros();
	future.then((roteiros){