Home Backend Development Golang Why Does My Go Code Throw a \'panic: runtime error: index out of range\' Error When the Array Length is Not Null?

Why Does My Go Code Throw a \'panic: runtime error: index out of range\' Error When the Array Length is Not Null?

Nov 01, 2024 am 06:34 AM

Why Does My Go Code Throw a

"Go “panic: runtime error: index out of range” When the Length of Array is Not Null

Analysis

The provided Go code encounters a runtime error due to accessing an index beyond the allowed range. When working with slices in Go, it's crucial to understand the concept of capacity and length.

Understanding Slices

A Go slice is a descriptor of an array segment. It encompasses a pointer to the array, the length of the segment, and its capacity (maximum length of the segment).

make([]string, 0, 4) vs. make([]string, 4)

The make function initializes and allocates slices. result := make([]string, 0, 4) creates a slice with length 0 and capacity 4, while result := make([]string, 4) (or its equivalent result := []string{"", "", "", ""}) initializes a slice with both length and capacity 4.

Array Access

In result := make([]string, 0, 4), the underlying array is empty, so accessing result[0] will cause a runtime error. In contrast, result := make([]string, 4) has four string elements, allowing access to result[0], result[1], result[2], and result[3].

Resolution for Your Code

In your myFunc function, you use the problematic result := make([]string, 0, 4) initialization. Given that your code requires appending elements, you should consider using result := make([]string, 0) and append elements using the append function. Alternatively, you could use result := []string{} or result := make([]string, 4), depending on your specific requirements.

Here's a working version of your code using make([]string, 0) and append (The Go Playground):

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

<code class="go">package main

 

import "fmt"

 

func main() {

    fmt.Println(myFunc("Political srt"))

}

 

func myFunc(input string) []string {

    strs := strings.Fields(input)

    result := make([]string, 0) // Initialize with length 0 and append as needed

    for _, s := range strs {

        if strings.ContainsAny(s, "eaiu") {

            result = append(result, s) // Append to the result slice

        }

    }

    return result

}</code>

Copy after login

The above is the detailed content of Why Does My Go Code Throw a \'panic: runtime error: index out of range\' Error When the Array Length is Not Null?. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

What are the vulnerabilities of Debian OpenSSL What are the vulnerabilities of Debian OpenSSL Apr 02, 2025 am 07:30 AM

OpenSSL, as an open source library widely used in secure communications, provides encryption algorithms, keys and certificate management functions. However, there are some known security vulnerabilities in its historical version, some of which are extremely harmful. This article will focus on common vulnerabilities and response measures for OpenSSL in Debian systems. DebianOpenSSL known vulnerabilities: OpenSSL has experienced several serious vulnerabilities, such as: Heart Bleeding Vulnerability (CVE-2014-0160): This vulnerability affects OpenSSL 1.0.1 to 1.0.1f and 1.0.2 to 1.0.2 beta versions. An attacker can use this vulnerability to unauthorized read sensitive information on the server, including encryption keys, etc.

How to specify the database associated with the model in Beego ORM? How to specify the database associated with the model in Beego ORM? Apr 02, 2025 pm 03:54 PM

Under the BeegoORM framework, how to specify the database associated with the model? Many Beego projects require multiple databases to be operated simultaneously. When using Beego...

Transforming from front-end to back-end development, is it more promising to learn Java or Golang? Transforming from front-end to back-end development, is it more promising to learn Java or Golang? Apr 02, 2025 am 09:12 AM

Backend learning path: The exploration journey from front-end to back-end As a back-end beginner who transforms from front-end development, you already have the foundation of nodejs,...

How to solve the user_id type conversion problem when using Redis Stream to implement message queues in Go language? How to solve the user_id type conversion problem when using Redis Stream to implement message queues in Go language? Apr 02, 2025 pm 04:54 PM

The problem of using RedisStream to implement message queues in Go language is using Go language and Redis...

What should I do if the custom structure labels in GoLand are not displayed? What should I do if the custom structure labels in GoLand are not displayed? Apr 02, 2025 pm 05:09 PM

What should I do if the custom structure labels in GoLand are not displayed? When using GoLand for Go language development, many developers will encounter custom structure tags...

What libraries are used for floating point number operations in Go? What libraries are used for floating point number operations in Go? Apr 02, 2025 pm 02:06 PM

The library used for floating-point number operation in Go language introduces how to ensure the accuracy is...

What is the problem with Queue thread in Go's crawler Colly? What is the problem with Queue thread in Go's crawler Colly? Apr 02, 2025 pm 02:09 PM

Queue threading problem in Go crawler Colly explores the problem of using the Colly crawler library in Go language, developers often encounter problems with threads and request queues. �...

How to configure MongoDB automatic expansion on Debian How to configure MongoDB automatic expansion on Debian Apr 02, 2025 am 07:36 AM

This article introduces how to configure MongoDB on Debian system to achieve automatic expansion. The main steps include setting up the MongoDB replica set and disk space monitoring. 1. MongoDB installation First, make sure that MongoDB is installed on the Debian system. Install using the following command: sudoaptupdatesudoaptinstall-ymongodb-org 2. Configuring MongoDB replica set MongoDB replica set ensures high availability and data redundancy, which is the basis for achieving automatic capacity expansion. Start MongoDB service: sudosystemctlstartmongodsudosys

See all articles