Master the common problems and solutions of array methods in Go language

Common problems and solutions for mastering array methods in Go language

In Go language, array is a basic data structure, which consists of the same data of fixed length Type of elements. When writing Go programs, we often use arrays to store a set of data. However, due to the characteristics and limitations of arrays in the Go language, some problems are more difficult when dealing with arrays. This article will introduce some common array problems and corresponding solutions, and provide specific code examples.

Question 1: How to declare and initialize an array?

In Go language, you can declare and initialize arrays in the following two ways:

1. Use array literals:

   var arr1 [3]int
   arr1 = [3]int{1, 2, 3}

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2. Use array initializer:

   arr2 := [3]int{1, 2, 3}

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Question 2: How to traverse the array elements and operate on each element?

You can use a for loop to traverse the array elements and operate on each element. The following is a sample code:

arr := [3]int{1, 2, 3}

for i := 0; i < len(arr); i++ {
    fmt.Println(arr[i])
}

Question 3: How to get the length and capacity of the array?

The length and capacity of the array are fixed and can be obtained through the len() and cap() functions respectively. The following is a sample code:

arr := [3]int{1, 2, 3}
fmt.Println("数组长度：", len(arr))
fmt.Println("数组容量：", cap(arr))

Question 4: How to pass arrays between functions?

In the Go language, arrays are passed by value between functions. If you want to modify an array element in a function, you can use a pointer or a slice as a parameter. The following is a sample code:

func modifyArray(arr [3]int) {
    arr[0] = 100
}

func main() {
    arr := [3]int{1, 2, 3}
    modifyArray(arr)
    fmt.Println(arr)  // 输出[1 2 3]
}

If you want to modify the array elements in the function, you can use a pointer or slice as a parameter, as shown below:

func modifyArray(arr *[3]int) {
    (*arr)[0] = 100
}

func main() {
    arr := [3]int{1, 2, 3}
    modifyArray(&arr)
    fmt.Println(arr)  // 输出[100 2 3]
}

Question 5: How to implement the sorting of the array?

The Go language provides the sort package to sort arrays. You can sort the integer array by introducing the sort package and then using the sort.Ints() function. The following is a sample code:

import "sort"

arr := [3]int{3, 1, 2}
sort.Ints(arr[:])
fmt.Println(arr)  // 输出[1 2 3]

The above are some common array problems and solutions. I hope this article can help readers better understand the use of arrays in Go language.

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