golang modifies slice type

Golang is a strongly typed language and has very strict requirements on the type of variables. When we need to modify the slice type, we often need to perform corresponding type conversion. This article will introduce how to modify the slice type in Golang.

What is slicing?

In Golang, slice is a more flexible and convenient data structure than array. A slice can be viewed as a partial reference to an array, where elements can be easily added, deleted, or modified. A slice consists of an underlying array pointer, slice length, and slice capacity.

Modify slice type

Suppose we have a slice of type []int, and now we need to modify it to a slice of type []string. Since Golang is a statically typed language, []int cannot be directly converted to []string type. However, we can achieve it through the following steps:

1. Define a new slice of type []string

var newSlice []string

2. Traverse the original slice and add each element Convert to string type and add to new slice

for _, v := range oldSlice {
    str := strconv.Itoa(v)
    newSlice = append(newSlice, str)
}

In the above code, we used the strconv.Itoa() function to convert the integer number to the string type. The function of this function is to convert an int type value into a string type representation.

3. Finally, we get a new slice of type []string, which can be used for subsequent operations.

fmt.Println(newSlice)

Complete code demonstration

The following is a complete code demonstration, which can be run to view the results:

package main

import (
    "fmt"
    "strconv"
)

func main() {
    oldSlice := []int{1, 2, 3, 4, 5}
    var newSlice []string

    for _, v := range oldSlice {
        str := strconv.Itoa(v)
        newSlice = append(newSlice, str)
    }

    fmt.Println(newSlice)
}

The running results are as follows:

[1 2 3 4 5]
[1 2 3 4 5]

Conclusion

In Golang, modifying the slice type requires type conversion. We can first define a new slice type, traverse the original slice, convert each element to the target type and add it to the new slice. Finally, a new slice type is obtained that can be used for subsequent operations.

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