golang string reverse

Go language (Golang) is a modern programming language with high performance and excellent toolbox. In Golang, string is the basic data type. In this article, we will explain how to reverse a string using Golang.

In Golang, a string is an immutable sequence composed of a series of Unicode characters. Reversing a string means turning the sequence upside down, and the first character becomes the last character, the second character becomes the second to last character, and so on. Here are some examples of reversing strings using Golang.

Method 1: Use []byte conversion

We can convert the string into a byte array, and then use a for loop to exchange the position of each element in the byte array. Finally, we can convert the reversed byte array back to a string. Here is the sample code:

func reverseString(s string) string {
    b := []byte(s)
    for i := 0; i < len(b)/2; i++ {
        j := len(b) - i - 1
        b[i], b[j] = b[j], b[i]
    }
    return string(b)
}

In the above code, we use the variable i to represent the first character in the string and the variable j to represent the last character in the string. Since strings in Golang are immutable, we convert the string into a byte array variable b so that we can swap in the byte array using a for loop. When i and j meet, we have completed the reversal of the entire string.

Method 2: Use rune conversion

We can also use the rune type to reverse the string. In Golang, the rune type represents a Unicode character. We can convert the string into a rune slice and then use a similar method to reverse the slice. Finally, we convert the rune slice back to a string. The following is an example code for using rune to reverse a string:

func reverseString(s string) string {
    r := []rune(s)
    for i := 0; i < len(r)/2; i++ {
        j := len(r) - i - 1
        r[i], r[j] = r[j], r[i]
    }
    return string(r)
}

In the above code, we use a slice variable r of rune type to represent the string to be reversed, and use a similar loop structure to Swap the elements in r.

Method 3: Using string concatenation

We can also use string concatenation to achieve string reversal. For example, we can iterate the string starting from the last character and concatenate each character into a new string. The following is a sample code for string concatenation to implement string reversal:

func reverseString(s string) string {
    result := ""
    for _, v := range s {
        result = string(v) + result
    }
    return result
}

In this method, we use an empty string variable as the output, and then iterate each character in the input string in reverse order to Concatenates to the beginning of a new string. Finally, return the string in positive order.

Summary

This article introduces three methods to reverse strings in Golang. Different methods are suitable for different scenarios. For short strings, you can use string concatenation. For medium-sized strings, it is more efficient to use the rune type. For longer strings, they should be converted to byte arrays. Learning these tips can help you better use the Golang programming language.

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