Golang (Go) Tutorial - Channels - Communication
📡 Channels - Goroutines Ko Connect Karo
🌟 Real Life Analogy:
📞 WhatsApp Chat:
Person A sends → Channel → Person B receives
Two goroutines communicate karne ka raasta!
🏭 Factory Assembly Line:
Worker 1 → Conveyor belt → Worker 2
Channel = Conveyor belt (data transfer karta)
📬 Post Office:
Sender → Mailbox (channel) → Receiver
🎯 Channel Kya Hai?
- Goroutines ke beech communication
- Data safely transfer karo
- Synchronization automatically
- Type-safe (sirf ek type ka data)
📝 Channel Syntax
Create & Use
// Create channel
ch := make(chan int)
// Send data (arrow towards channel)
ch <- 42
// Receive data (arrow from channel)
value := <-ch📊 Channel Types
| Type | Description | Example |
|---|---|---|
| Unbuffered | Direct handoff | make(chan int) |
| Buffered | Queue with capacity | make(chan int, 5) |
| Send-only | chan<- int | Only send |
| Receive-only | <-chan int | Only receive |
🔄 Unbuffered vs Buffered
Unbuffered Channel
Analogy: Phone call - dono ka saath hona zaroori
ch := make(chan int)
// Sender waits until receiver readyBuffered Channel
Analogy: Mailbox - chhod do, baad mein le lenge
ch := make(chan int, 3) // 3 messages store kar sakta
// Up to 3 sends without waiting⚠️ Deadlock Warning!
Agar send kiya lekin receive nahi → Program hang!
Always ensure receiver exists for sender.
💡 Common Patterns
1. Producer-Consumer
// Producer
go func() {
ch <- data
}()
// Consumer
result := <-ch2. Select Statement (Multiple Channels)
select {
case msg1 := <-ch1:
// Handle ch1
case msg2 := <-ch2:
// Handle ch2
case <-time.After(1 * time.Second):
// Timeout
}Example
ch := make(chan int)
ch <- 42 // Send
value := <-ch // Receive