Go language implementation: How to delete specified elements in a slice

There are two ways to delete specified elements from Go slices: use the append function to create a new slice and remove the specified elements; use the copy function to copy the slice and rearrange the elements to exclude the specified elements.

Go language: Remove specified elements from a slice

A slice in Go language is a dynamic array that allows to store the same type of element. Sometimes we may need to remove specific elements from a slice. This article will introduce two methods to delete specified elements from a slice in Go language.

Method 1: Using the append function

append function can be used to remove elements from a slice. It creates a new slice containing all the elements of the passed slice, except the deleted elements. For example:

package main

import "fmt"

func main() {
    slice := []int{1, 2, 3, 4, 5}
    elementToRemove := 3

    // 从切片中删除 elementToRemove
    newSlice := append(slice[:elementToRemove-1], slice[elementToRemove:]...)

    fmt.Println(newSlice) // 输出： [1 2 4 5]
}

Method 2: Using the copy function

copy function can be used to copy the elements of the slice to In another slice. We can use this to create a new slice that does not contain the deleted elements. For example:

package main

import "fmt"

func main() {
    slice := []int{1, 2, 3, 4, 5}
    elementToRemove := 3

    // 创建一个新的切片，不包含 elementToRemove
    newSlice := make([]int, len(slice)-1)
    copy(newSlice, slice[:elementToRemove-1])
    copy(newSlice[elementToRemove-1:], slice[elementToRemove:])

    fmt.Println(newSlice) // 输出： [1 2 4 5]
}

Practical case

Consider a scenario where we need to delete a character from the user's input. We can use the following code:

package main

import (
    "fmt"
    "strings"
)

func main() {
    var input string
    fmt.Print("请输入一个字符串：")
    fmt.Scanln(&input)

    // 删除输入中的字符 'a'
    input = strings.ReplaceAll(input, "a", "")

    fmt.Println("删除 'a' 后的字符串：", input)
}

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