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php小編百草帶您了解在Golang中如何打印2個列表。在Golang中，我們可以使用fmt包中的Println函數來打印列表。首先，我們需要將兩個列表分別定義并初始化，然后使用Println函數將它們打印出來。通過使用循環和索引變量，我們可以逐個遍歷列表中的元素，并將它們打印出來。這樣，我們就能夠在Golang中輕松地打印出2個列表的內容。

問題內容

有點被這個問題困擾了。我的想法是有一個打印兩列表的函數。第一個用于鍵，它具有固定的寬度。第二個是值，可能是很長的字符串，其寬度取決于終端的當前寬度。

我想要的一個例子：

key1                                  value1value1value1value1
key2                                  value2value2value2value2value2value2value2value2value2value2value2
                                      value2value2value2value2value2value2value2value2value2value2value2
                                      value2value2value2value2value2value2

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到目前為止，我取得的最好成果是使用唇彩為第一列設置固定寬度。

func printmetadata(metadata map[string]string, color string) {
    style := lipgloss.newstyle().width(32).foreground(lipgloss.color(color))
    for k, v := range metadata {
        fmt.println(style.render(k) + v)
    }
}

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其結果類似于：

Key1                                  Value1Value1Value1Value1
Key2                                  Value2Value2Value2Value2Value2Value2Value2Value2Value2Value2Value2
Value2Value2Value2Value2Value2Value2Value2Value2Value2Value2Value2Value2Value2Value2Value2Value2Value2

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那么，如何按照我想要的方式格式化字符串呢？我可以使用標準庫和外部庫，因此歡迎任何建議。

解決方法

我為此創建了一個函數。該函數有兩個參數，第一個用于列的映射變量，第二個參數用于每行填充多少個字符。它只是將鍵的值內容與空格更改為新變量，然后打印該鍵值。但如果您有未修改值的作品，則可以使用未修改變量。

package main

import (
    "fmt"
    "errors"
    "strings"
    "sort"
)

func main() {
    a := map[string]string{
    "key1": strings.repeat("value1", 50), 
    "key2": strings.repeat("value2", 50), 
    "key3": strings.repeat("value3", 50),
    }
    
    err := columner(a, 30)
    
    if err != nil {
        fmt.println(err)
    }
    
}

func columner(m map[string]string, charamount int) error{

    var keys []string
    
    var keylens []int
    
    // to avoid index panics and gathering keys for later usage
    for key, value := range m {
        if charamount > len(value) || charamount < 1{
            return errors.new("error: charamount neither be greather than length of key's value nor below 1")
        }
        keys = append(keys, key)
        keylens = append(keylens, len(key))
    }

    sort.ints(keylens)
    
    for i := 0; i < len(keys); i++ {
        
        // for storing updated value of key
        var value2 string
        
        value := m[keys[i]]
        // will used while extracting substring of key's value as first index
        firsti := 0
        
        // last index for extract substring from key's value. the len of substring will be same as charamount
        charamount2 := charamount
        
        // will be used to advance next substring of key's value
        advance := charamount2
        
        // spaces between between key and value 
        // key       value
        spacing := strings.repeat(" ", 20 + (keylens[0] - len(keys[i])))
        
        // var for adjusting spaces of gap between key and value of next line
        // key        value
        //          value
        // to
        // key        value
        //            value
        spacingu := spacing + strings.repeat(" ", len(keys[i]) + 1)
        
        // this loop will be run as long as there is no substring left which exceed next line
        for j := 0; j  0 {
                spacing = spacingu
            }
            
            // add space between key and value, then extract substring, then add spaces to the next line of the
            // next substring of key's value
            value2 += spacing + value[firsti:charamount2] + "\n"
            
            // finish loop when there is no substring that can be exceed to next line
            if ((len(value) - charamount2) < advance) || ((len(value) - charamount2) == advance) {
                break
            }
    
            // changing first index to start index of next substring of key's value
            firsti = charamount2
            
            // advancing to next substring of key's value
            charamount2 += advance
        }   
        
        // add last remaining substring of key's value to variable which will be show as formatted.
        value2 += spacing + value[charamount2:]

        // show formatted key and value
        fmt.println(keys[i], value2, "\n")
        
    }
    
    return nil
}

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這是一個示例輸出：

Key1                     Value1Value1Value1Value1Value1
                         Value1Value1Value1Value1Value1
                         Value1Value1Value1Value1Value1
                         Value1Value1Value1Value1Value1
                         Value1Value1Value1Value1Value1
                         Value1Value1Value1Value1Value1
                         Value1Value1Value1Value1Value1
                         Value1Value1Value1Value1Value1
                         Value1Value1Value1Value1Value1
                         Value1Value1Value1Value1Value1 

Key2                     Value2Value2Value2Value2Value2
                         Value2Value2Value2Value2Value2
                         Value2Value2Value2Value2Value2
                         Value2Value2Value2Value2Value2
                         Value2Value2Value2Value2Value2
                         Value2Value2Value2Value2Value2
                         Value2Value2Value2Value2Value2
                         Value2Value2Value2Value2Value2
                         Value2Value2Value2Value2Value2
                         Value2Value2Value2Value2Value2 

Key3                     Value3Value3Value3Value3Value3
                         Value3Value3Value3Value3Value3
                         Value3Value3Value3Value3Value3
                         Value3Value3Value3Value3Value3
                         Value3Value3Value3Value3Value3
                         Value3Value3Value3Value3Value3
                         Value3Value3Value3Value3Value3
                         Value3Value3Value3Value3Value3
                         Value3Value3Value3Value3Value3
                         Value3Value3Value3Value3Value3

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但請注意這一點，每次執行時鍵和值的順序可能不同，因為在帶有鍵、值對的 for 循環中打印時映射類型是無序的。