r/golang

So, I'm pretty new to both Go and concurrency (I've been programming with other languages like C# and Python for some time but never learned concurrency/multi-threaded programming, only ever used "async/await" stuff which is quite different).

I'm going through , the first exercise which is about making a quiz with a timer.

This is the solution I came up with myself, and it is pretty different from the solution of the author (Jon Calhoun).

My code "works", not perfectly but it works... I've asked ChatGPT and read through it's answer but I still can not really understand why mine is not an optimal solution.

Could you take a look and help me out?

package main

import (
"encoding/csv"
"flag"
"fmt"
"log"
"os"
"strings"
"time"
)

func main() {
csvProvided := flag.String("csv", "problems.csv", "csv file containing problem set")
timeLimitProvided := flag.Int("time", 5, "time limit")
flag.Parse()

// Open the CSV file
csvFile, err := os.Open(*csvProvided)
if err != nil {
log.Fatalf("Error opening csv file: %v", err)
}
defer csvFile.Close()

// Read the CSV data
reader := csv.NewReader(csvFile)
data, err := reader.ReadAll()
if err != nil {
log.Fatalf("Error reading csv file: %v", err)
}

correctCount := 0

fmt.Printf("Press Enter to start the quiz (and the timer of %d seconds)...\n", *timeLimitProvided)
fmt.Scanln()

workDone := make(chan bool)
timer := time.NewTimer(time.Duration(*timeLimitProvided) * time.Second)

go func() {
for _, problem := range data {
question := problem[0]
answer := problem[1]

fmt.Printf("%s = ", question)
var userAnswer string
fmt.Scanln(&userAnswer)
userAnswer = strings.TrimSpace(userAnswer)

if userAnswer == answer {
correctCount++
}
}

workDone <- true
}()

select {
case <-timer.C:
fmt.Println("TIME'S UP!")
fmt.Printf("\nYou scored %d out of %d\n", correctCount, len(data))
case <-workDone:
fmt.Printf("\nYou scored %d out of %d\n", correctCount, len(data))
}
}

hi so im trying to build a streaming server from scratch with no packages because im trying to learn. i need to transform mp4 to h.264 any recommendations for material to read abot this topic and how verything works. open to hear suggestions on how you would approach this problem