Elegant programming practice: interpretation of else removal techniques in Go language

Elegant Programming Practice: Interpretation of Else Removal Skills in Go Language

In software development, writing elegant code is one of the goals pursued by every programmer. In programming practice, sometimes we find some techniques that can help us simplify the code logic and make the code more concise and readable. This article will introduce a technique commonly used in Go language: removing else.

1. Why should we remove else

In programming, the if-else structure is a common conditional control statement. But in actual coding, we often encounter situations where the else branch in the if-else statement is just to return a value or perform a simple operation. At this time, using the if-else structure seems a bit redundant. Directly converting if-else into a separate if statement can make the code more concise and clear.

2. Sample code

Below we use a specific sample code to show how to simplify the code logic by removing else. Suppose we have a function that determines whether a number is negative and returns the corresponding string.

package main

import (
    "fmt"
)

func checkNegative(num int) string {
    if num < 0 {
        return "负数"
    }
    return "非负数"
}

func main() {
    num1 := -1
    num2 := 1

    fmt.Printf("%d 是%s
", num1, checkNegative(num1))
    fmt.Printf("%d 是%s
", num2, checkNegative(num2))
}

In the above code example, we defined a function checkNegative that receives an integer parameter num. If num is less than 0, Then return "negative number", otherwise return "non-negative number". In the main function, we call the checkNegative function on -1 and 1 respectively, and print the output results. Running the code, we can get the following output:

-1 是负数
1 是非负数

3. Tips for removing else

In the above example code, we use the if-else structure to determine whether a number is negative. But actually, we can make the code more concise by canceling else. The modified code is as follows:

package main

import (
    "fmt"
)

func checkNegative(num int) string {
    if num < 0 {
        return "负数"
    }
    return "非" + "负数" // 使用字符串拼接避免else
}

func main() {
    num1 := -1
    num2 := 1

    fmt.Printf("%d 是%s
", num1, checkNegative(num1))
    fmt.Printf("%d 是%s
", num2, checkNegative(num2))
}

4. Conclusion

By removing else, we can make the code more concise and readable. In actual coding, when encountering a branch with only a single operation, you may wish to consider using this technique to simplify the code. Of course, for complex logic, you still need to choose to use the if-else structure according to the actual situation. Elegant programming is a process of continuous exploration. I hope this article will be helpful to everyone in removing else in Go language.

Reference

1. [The Go Programming Language Specification](https://golang.org/ref/spec)
2. [Effective Go](https: //golang.org/doc/effective_go)

I hope that through the above interpretation, readers can better understand the technique of removing else in the Go language and use it flexibly in actual development. I hope the code you write will be more elegant and concise!

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