php editor Baicao will show you how to print 2 lists in Golang. In Golang, we can use the Println function in the fmt package to print the list. First, we need to define and initialize the two lists separately, and then use the Println function to print them out. By using a loop and an index variable, we can iterate through the elements of the list one by one and print them out. In this way, we can easily print out the contents of 2 lists in Golang.
I am a little troubled by this problem. My idea is to have a function that prints two columns. The first one is for keys, which has a fixed width. The second is the value, which may be a very long string whose width depends on the current width of the terminal.
An example of what I want:
key1 value1value1value1value1 key2 value2value2value2value2value2value2value2value2value2value2value2 value2value2value2value2value2value2value2value2value2value2value2 value2value2value2value2value2value2
The best I've achieved so far is using lipgloss to set a fixed width for the first column.
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) } }
The result is similar to:
Key1 Value1Value1Value1Value1 Key2 Value2Value2Value2Value2Value2Value2Value2Value2Value2Value2Value2 Value2Value2Value2Value2Value2Value2Value2Value2Value2Value2Value2Value2Value2Value2Value2Value2Value2
So, how do I format a string the way I want? I can use both the standard library and external libraries, so any suggestions are welcome.
I created a function for this. This function takes two parameters, the first is a mapping variable for the column, and the second is how many characters to fill each row with. It just changes the value content of the key with spaces into a new variable and then prints the key value. But if you have works with unmodified values, you can use unmodified variables.
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 < len(value); j += advance { // adjusting spaces of gap between key and value of next line if 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 }
This is a sample output:
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
But please note this, the order of keys and values may be different on each execution, because the map type is unordered when printing in a for loop with key, value pairs.
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