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go - fix nil pointer dereference errors

CL answered on March 2, 2023 Popularity 1/10 Helpfulness 1/10

answer go - fix nil pointer dereference errors

go - fix nil pointer dereference errors

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package main

import "fmt"

type Rectangle struct {
    Width  int
    Height int
}

func (r *Rectangle) Area() int {
    return r.Width * r.Height
}

func main() {
    var rect *Rectangle      // default value is nil
    // replace this
    // fmt.Println(rect.Area()) // this will panic
    // with this
    if rect != nil {
        fmt.Println(rect.Area())
    } else {
        fmt.Println("rect is nil!")
    }
}

Popularity 1/10 Helpfulness 1/10 Language go

Source: levelup.gitconnected.com

Tags: dereference go

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