bootdotdev-fcc-learn-golang-assets/course/13-channels/exercises/2-channels_deadlock/code.go

package main

import (
	"fmt"
	"time"
)

func filterOldEmails(emails []email) {
	isOldChan := make(chan bool)

	for _, e := range emails {
		if e.date.Before(time.Date(2020, 0, 0, 0, 0, 0, 0, time.UTC)) {
			isOldChan <- true
			continue
		}
		isOldChan <- false
	}

	isOld := <-isOldChan
	fmt.Println("email 1 is old:", isOld)
	isOld = <-isOldChan
	fmt.Println("email 2 is old:", isOld)
	isOld = <-isOldChan
	fmt.Println("email 3 is old:", isOld)
}

// TEST SUITE -- Don't touch below this line

type email struct {
	body string
	date time.Time
}

func test(emails []email) {
	filterOldEmails(emails)
	fmt.Println("==========================================")
}

func main() {
	test([]email{
		{
			body: "Are you going to make it?",
			date: time.Date(2019, 0, 0, 0, 0, 0, 0, time.UTC),
		},
		{
			body: "I need a break",
			date: time.Date(2021, 0, 0, 0, 0, 0, 0, time.UTC),
		},
		{
			body: "What were you thinking?",
			date: time.Date(2022, 0, 0, 0, 0, 0, 0, time.UTC),
		},
	})
	test([]email{
		{
			body: "Yo are you okay?",
			date: time.Date(2018, 0, 0, 0, 0, 0, 0, time.UTC),
		},
		{
			body: "Have you heard of that website Boot.dev?",
			date: time.Date(2017, 0, 0, 0, 0, 0, 0, time.UTC),
		},
		{
			body: "It's awesome honestly.",
			date: time.Date(2016, 0, 0, 0, 0, 0, 0, time.UTC),
		},
	})
	test([]email{
		{
			body: "Today is the day!",
			date: time.Date(2019, 0, 0, 0, 0, 0, 0, time.UTC),
		},
		{
			body: "What do you want for lunch?",
			date: time.Date(2021, 0, 0, 0, 0, 0, 0, time.UTC),
		},
		{
			body: "Why are you the way that you are?",
			date: time.Date(2022, 0, 0, 0, 0, 0, 0, time.UTC),
		},
	})
	test([]email{
		{
			body: "Did we do it?",
			date: time.Date(2019, 0, 0, 0, 0, 0, 0, time.UTC),
		},
		{
			body: "Letsa Go!",
			date: time.Date(2021, 0, 0, 0, 0, 0, 0, time.UTC),
		},
		{
			body: "Okay...?",
			date: time.Date(2022, 0, 0, 0, 0, 0, 0, time.UTC),
		},
	})
}