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Select Notions You Should Know in Golang

Mastering Go’s Select: Beyond the Basics

Wesley Wei
Programmer’s Career

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golang select (from github.com/MariaLetta/free-gophers-pack)

Hello, here is Wesley, Today’s article is about select in Go. Without further ado, let’s get started.💪

1.1 Select Introduction

In the Go language, the select statement is used to handle multiple channel operations and simplify concurrent programming's communication and synchronization issues. The select statement is similar to the switch statement, but each case must be a channel operation.

Here is the basic syntax of the select statement:

select {
case <-chan1:
// Executed when chan1 has data to receive
case chan2 <- value:
// Executed when data can be sent to chan2
default:
// Executed when none of the cases are satisfied
}

Use Cases

  • Multiple Channel Selection: You can wait for multiple channel operations simultaneously, and when any one of them is ready, the program will execute the corresponding case.
  • Timeout Handling: By combining with the time.After function, you can implement a timeout mechanism.
  • Non-blocking Communication: By using the default clause, you can achieve non-blocking channel operations.

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