How to ignore function return value in golang?

In the Go language, you can use the underscore identifier _ to ignore the function return value: _ means ignore the first return value. Specify variable names to capture subsequent return values ​​(such as error handling). It is recommended to ignore return values ​​only when they are clearly not required.

Ignore function return value in Go language

In Go language, sometimes we may need to ignore function return value without use it. This can be achieved by using the _ underscore identifier.

Syntax

_, err := someFunction()

This syntax means:

• _ means we will ignore someFunction The first value returned.
• err means we will capture the second (error) value returned by someFunction.

Practical Case

A common use case is to handle errors without caring about the error message. For example, the following code opens a file and catches the error in err, but ignores the file object:

_, err := os.Open("myfile.txt")
if err != nil {
    // 处理错误
}

Multiple return values

If you To ignore multiple return values, you can use multiple _ identifiers:

_, _, err := someFunction()

Warning

Although ignoring return values ​​is a common technology, but it's not always best practice. In most cases, you should handle errors or use return values. Values ​​should be ignored only if you know explicitly that they are not required.

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