golang slice culling

golang slice elimination

In the Go language, slice (slice) is a very important and commonly used data structure. It is similar to an array, but more flexible and convenient than an array. Slices can be automatically expanded, while the length of arrays is immutable. However, in the actual development process, we may encounter situations where we need to eliminate an element in the slice. In this article, we will explore how to perform slice culling operations in the Go language.

Basic operations of slicing

Before understanding how to remove an element from a slice, we need to understand some basic operations of slicing.

Create a slice

In the Go language, you can create a slice type variable through the make() function. The parameters of the make() function are slice type, slice length and slice capacity. The slice capacity can be omitted and defaults to the same as the slice length.

s := make([]int, 5, 10)
// 创建一个长度为5、容量为10的int类型切片s

Accessing slice elements

Like arrays, access elements in the slice through subscripts.

s := []int{1, 2, 3, 4, 5}
fmt.Println(s[0]) // 输出1

Interception of slices

In Go language, slices can be intercepted through s[i:j], where i is the starting index (inclusive) and j is the ending index. mark (not included). For example, s[2:5] represents a slice starting from the element with index 2 and ending with the element with index 4.

s := []int{1, 2, 3, 4, 5}
fmt.Println(s[1:3]) // 输出[2 3]

Append to slice

In Go language, you can use the append() function to add elements to a slice. If appending elements to the slice results in insufficient capacity, the underlying array is automatically expanded. The first parameter of the append() function is the slice to be appended, and the subsequent parameters are the values ​​to be appended.

s := []int{1, 2, 3}
s = append(s, 4, 5)
fmt.Println(s) // 输出[1 2 3 4 5]

Copying of slices

In the Go language, you can use the copy() function to copy one slice to another slice. The first parameter of the copy() function is the target slice, and the second parameter is the source slice. If the source slice length is greater than the target slice length, the first n elements in the source slice will be intercepted (n is the target slice length). If the source slice length is less than or equal to the target slice length, other elements in the target slice except the copied elements will not be affected.

s1 := []int{1, 2, 3}
s2 := make([]int, 2)
copy(s2, s1)
fmt.Println(s2) // 输出[1 2]

Slice elimination

After understanding the basic operations of slices, we can start to explore how to perform slice elimination operations in the Go language.

Method 1: Implemented through the append() function and slice interception

We can first obtain the front and back parts of the element to be deleted through slice interception, and then pass them through append( ) functions can be added together.

func deleteSlice1(s []int, i int) []int {
    return append(s[:i],s[i+1:]...)
}

s := []int{1, 2, 3, 4, 5}
s = deleteSlice1(s, 2)
fmt.Println(s) // 输出[1 2 4 5]

Method 2: Implemented through the copy() function and slice interception

We can also implement the slice elimination operation through the copy() function. We can use the copy function to copy the subsequent elements of the element to be deleted to the position of the element to be deleted, and then obtain the first half and the second half through the slicing and interception operation.

func deleteSlice2(s []int, i int) []int {
    copy(s[i:], s[i+1:])
    return s[:len(s)-1]
}

s := []int{1, 2, 3, 4, 5}
s = deleteSlice2(s, 2)
fmt.Println(s) // 输出[1 2 4 5]

Summary

In this article, we explain the basic operations of slicing and two methods of implementing slice elimination operations, hoping to help readers have a deeper understanding of slicing in the Go language. Data structures and their applications. In actual development, choosing different methods to implement slice elimination operations according to specific circumstances can improve code efficiency and maintainability.

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