Detailed explanation of array methods in Go language: basic concepts and usage

Detailed explanation of Go language array methods: basic concepts and usage

Go language is a compiled language developed by Google. It has simplicity, efficiency and built-in concurrency. characteristics and have received widespread attention and application. In Go language, array is a basic data structure used to store elements of the same type. This article will introduce the basic concepts and usage of arrays in Go language, and explain in detail with specific code examples.

Definition and initialization of arrays

In the Go language, the definition format of an array is: var variable name [length] type. Among them, the length is the number of elements that the array can store, and the type represents the type of elements stored in the array. For example, define an array containing 5 integers:

var arr [5]int

The initialization of the array can use curly braces {} to assign the initial value. It can be initialized at the same time as the declaration, or it can be initialized later. For example:

var arr = [5]int{1, 2, 3, 4, 5}
var arr2 [5]int
arr2 = [5]int{1, 2, 3, 4, 5}

Basic operations of arrays

Accessing elements

Access elements in the array through subscripts, and the subscripts start from 0. For example:

fmt.Println(arr[0]) // 输出数组arr中第一个元素的值

Modify elements

You can modify elements in the array through subscripts. For example:

arr[0] = 10 // 修改数组arr中第一个元素的值为10

Array method

len() function

The length of the array can be obtained through the len() function. For example:

fmt.Println(len(arr)) // 输出数组arr的长度

range keyword

range keyword is used to iterate over array elements. For example:

for index, value := range arr {
    fmt.Printf("索引: %d, 值: %d
", index, value)
}

Sample code

The following is a complete sample code that demonstrates the definition, initialization and basic operations of the array:

package main

import "fmt"

func main() {
    // 定义并初始化一个包含5个整数的数组
    var arr = [5]int{1, 2, 3, 4, 5}

    // 打印数组arr的长度
    fmt.Println(len(arr))

    // 遍历数组并输出索引和值
    for index, value := range arr {
        fmt.Printf("索引: %d, 值: %d
", index, value)
    }

    // 修改数组arr中的第一个元素为10
    arr[0] = 10

    fmt.Println(arr[0]) // 输出数组arr中第一个元素的值
}

Through the introduction of this article, readers can Understand the basic concepts and usage of arrays in Go language, and master the definition, initialization and basic operations of arrays. I hope this article will be helpful to readers, and everyone is welcome to learn more about the Go language.

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