Concurrent execution model in Go - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a goroutine in Go?

A goroutine is a lightweight thread managed by the Go runtime. It allows functions to run concurrently without the overhead of traditional threads.

beginner

How do you start a goroutine?

Use the keyword go before a function call, like go myFunction(), to start it as a goroutine.

intermediate

What is a channel in Go's concurrent model?

A channel is a typed conduit through which goroutines communicate by sending and receiving values, helping to synchronize execution.

beginner

Why is concurrency important in Go?

Concurrency lets Go programs handle multiple tasks at once, improving efficiency and responsiveness, especially for I/O or network operations.

intermediate

What happens if a goroutine tries to send on a channel but no one is receiving?

The goroutine blocks (waits) until another goroutine receives from the channel, ensuring safe communication without data loss.

How do you create a new goroutine in Go?

A By using 'thread.start()'

B By calling 'new goroutine()'

C By importing 'concurrent' package

D By prefixing a function call with 'go'

In Go, you start a goroutine by prefixing a function call with the keyword 'go'.

What is the main purpose of channels in Go?

A To store data permanently

B To create new goroutines

C To communicate and synchronize between goroutines

D To handle errors

Channels allow goroutines to send and receive data, enabling communication and synchronization.

What happens when a goroutine sends data on an unbuffered channel with no receiver?

A The program crashes

B The goroutine blocks until another goroutine receives

C The data is lost

D The data is queued automatically

Sending on an unbuffered channel blocks the sender until a receiver is ready.

Which Go feature helps run multiple functions at the same time?

A Goroutines

B Interfaces

C Structs

D Maps

Goroutines allow concurrent execution of functions.

What keyword is used to receive data from a channel?

A <-

B go

C chan

D send

The '<-' operator is used to send or receive data on channels.

Explain how goroutines and channels work together in Go's concurrent execution model.

Think about how two friends pass notes to coordinate their work.

Describe what happens when you start a goroutine and how it differs from a normal function call.

Imagine starting a new task that runs alongside your current one.