Classification and explanation of Golang errors

Classification and explanation of Golang errors

1. Error handling is an integral part of programming, and in Golang, the error handling mechanism is through the error interface to achieve. In the actual development process, we often encounter various errors, so having clear classifications and explanations of different types of errors can help us better locate and deal with problems. This article will introduce common error classifications and related code examples in Golang.

1. Type assertion error (type assertion error)
   Type assertion error usually occurs in a type assertion operation, that is, when trying to convert an interface value to a specific type, it fails. When a type assertion fails, the program will generate a panic, so we usually need to perform type checking before type assertion to avoid panic.

var i interface{} = "hello"
s := i.(int) // Type assertion failure will cause panic

2. Nil pointer error (nil pointer error)
   Null pointer error refers to when operating on a null pointer An error occurred. In Golang, a panic is triggered when reading or writing a null pointer. Therefore, when using pointers, null pointer judgment needs to be performed to avoid null pointer errors.

var p *int
fmt.Println(*p) // Null pointer error will cause panic

3. array out of bounds error
   array out of bounds error refers to trying to access a value that does not exist in the array An error occurred while indexing the position. In Golang, array indexes start from 0, and accessing an out-of-range index position will trigger a panic. Therefore, when accessing an array, you need to ensure that the index is within the valid range.

arr := []int{1, 2, 3}
fmt.Println(arr[3]) // Array out-of-bounds error will cause panic

4. Channel close error (channel close error)
   Channel close error refers to executing on a closed channel An error occurred while sending the operation. In Golang, closing a closed channel or sending data to a closed channel will trigger a panic. Therefore, when using channels, you need to ensure that no send operations are performed on closed channels.

ch := make(chan int)
close(ch)
ch <- 1 // Channel closing error will cause panic

The above are common error classifications and related code examples in Golang. By classifying and explaining errors, we can better understand the source of errors and improve the robustness and reliability of the code. In the programming process, timely detection and handling of errors is an important part of improving program quality. I hope this article is helpful to you, thank you for reading!

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