我如何改善代码？

Question

I'm beginner in programming. Could i use two elements in golang for-loops? If you know answer, or material which i should read, please help me.

package main

import (
    "fmt"
)

func main() {
    x := []int{
        48, 96, 86, 68,
        57, 82, 63, 70,
        37, 34, 83, 27,
        19, 97, 9, 17,
    }

    for a := 0, b := 1; a++, b++ {
        if x[a] > x[b] {
            x = append(x[:1], x[1+1:]...)
            fmt.Println("x[1+1:]x)", x)
        } else {
            x = append(x[:0], x[0+1:]...)
            fmt.Println("x[0+1:]x)", x)
        }
    }

}

Answer 1

Yes, you can, although it's unnecessary in this case.

The syntax function fixes the syntax and other errors in your code so that your code runs and produces output. The idiom function rewrites your code in a more idiomatic form.

package main

import (
    "fmt"
)

func syntax() {
    x := []int{
        48, 96, 86, 68,
        57, 82, 63, 70,
        37, 34, 83, 27,
        19, 97, 9, 17,
    }

    for a, b := 0, 1; a < len(x) && b < len(x); a, b = a+1, b+1 {
        if x[a] > x[b] {
            x = append(x[:1], x[1+1:]...)
            fmt.Println("x[1+1:]x)", x)
        } else {
            x = append(x[:0], x[0+1:]...)
            fmt.Println("x[0+1:]x)", x)
        }
    }
}

func idiom() {
    x := []int{
        48, 96, 86, 68,
        57, 82, 63, 70,
        37, 34, 83, 27,
        19, 97, 9, 17,
    }

    for i := 1; i < len(x); i++ {
        if x[i-1] > x[i] {
            x = append(x[:1], x[1+1:]...)
            fmt.Println("x[1+1:]x)", x)
        } else {
            x = append(x[:0], x[0+1:]...)
            fmt.Println("x[0+1:]x)", x)
        }
    }
}

func main() {
    syntax()
    fmt.Println()
    idiom()
}

Output:

$ go run beginner.go
x[0+1:]x) [96 86 68 57 82 63 70 37 34 83 27 19 97 9 17]
x[1+1:]x) [96 68 57 82 63 70 37 34 83 27 19 97 9 17]
x[0+1:]x) [68 57 82 63 70 37 34 83 27 19 97 9 17]
x[0+1:]x) [57 82 63 70 37 34 83 27 19 97 9 17]
x[1+1:]x) [57 63 70 37 34 83 27 19 97 9 17]
x[1+1:]x) [57 70 37 34 83 27 19 97 9 17]
x[0+1:]x) [70 37 34 83 27 19 97 9 17]
x[0+1:]x) [37 34 83 27 19 97 9 17]

x[0+1:]x) [96 86 68 57 82 63 70 37 34 83 27 19 97 9 17]
x[1+1:]x) [96 68 57 82 63 70 37 34 83 27 19 97 9 17]
x[0+1:]x) [68 57 82 63 70 37 34 83 27 19 97 9 17]
x[0+1:]x) [57 82 63 70 37 34 83 27 19 97 9 17]
x[1+1:]x) [57 63 70 37 34 83 27 19 97 9 17]
x[1+1:]x) [57 70 37 34 83 27 19 97 9 17]
x[0+1:]x) [70 37 34 83 27 19 97 9 17]
x[0+1:]x) [37 34 83 27 19 97 9 17]

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