Golang compilation error: "undefined: fmt.Sprint" How to solve it?

Compilation errors in golang are one of the problems often encountered during the development process. Among them, a common compilation error is "undefined: fmt.Sprint".

In this article, we will explore the causes of this compilation error and how to solve it.

Error reason

This error usually occurs when using the Sprint function in the fmt package of the standard library. For example, the following code will cause the above error when compiling:

package main

import "fmt"

func main() {
    name := "John"
    age := 30
    fmt.Println(fmt.Sprint(name, " is ", age, " years old."))
}

This is because in newer golang versions, fmt.Sprint has been deleted. Instead, the corresponding functions such as fmt.Sprintf or fmt.Print should be used instead of fmt.Sprint. Therefore, we can change the code as follows:

package main

import "fmt"

func main() {
    name := "John"
    age := 30
    fmt.Println(fmt.Sprintf("%s is %d years old.", name, age))
}

Solution

To resolve this compilation error, the easiest way is to replace fmt.Sprint with fmt.Sprintf or corresponding function. We can create a string using the fmt.Sprintf function and then pass that string to the fmt.Println function to print it.

The usage of fmt.Sprintf is exactly the same as fmt.Sprint except for the calling function name. You can pass a format string as the first argument, followed by any number of values ​​to format.

The following is an example of using fmt.Sprintf:

package main

import "fmt"

func main() {
    name := "John"
    age := 30
    fmt.Println(fmt.Sprintf("%s is %d years old.", name, age))
}

In the above example code, we use the fmt.Sprintf function to create a string and pass it to the fmt.Println function to print it.

Conclusion

undefined: fmt.Sprint is one of the common compilation errors in golang, usually caused by using functions that have been deleted. To solve this kind of error, we can use alternative methods like fmt.Sprintf or corresponding functions. It is important to notice this error when writing the code to avoid modification and maintenance of the code later.

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