Exception handling in golang custom function implementation

There are three ways to handle custom function exceptions in Go: use the panic built-in function (see the article for syntax). Practical case: define divide function, when the divisor is 0, panic advantages: convenient, customizable error message, can be Disadvantages of handling errors at different function levels: disrupting program flow, making debugging difficult

Exception handling in custom functions in Go

Handling custom functions in Go There are many methods for exceptions. One way is to use the panic built-in function. panic passes program control to the recover function, allowing you to handle the exception and safely resume program execution.

Syntax

package main

import "fmt"

func main() {
    f := func() {
        panic("custom error")
    }

    defer func() {
        if r := recover(); r != nil {
            fmt.Println("Recovered from panic:", r)
        }
    }()

    f()
}

Note: The defer statement must be placed before the panic statement so that panic occurs is called when.

Practical Case

We define a custom function named divide, which divides two numbers. If the divisor is 0, the function triggers an exception:

package main

import "fmt"

func main() {
    divide := func(numerator, denominator int) float64 {
        if denominator == 0 {
            // 触发错误
            panic("不能除以 0")
        }

        return float64(numerator) / float64(denominator)
    }

    defer func() {
        if r := recover(); r != nil {
            fmt.Println("错误：", r)
        }
    }()

    result := divide(10, 2)
    fmt.Println(result) // 输出：5

    result = divide(10, 0) // 触发错误
}

Output:

5
错误： 不能除以 0

Advantages

• Convenient and easy to implement.
• Allows you to define custom error messages.
• Errors can be handled at different function levels.

Disadvantages

• May disrupt program flow.
• May be difficult to debug for large programs.

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