Golang : Find the longest line of text example

Ability to find the longest find in a given text file can be useful in a situation where you want to pre-process a raw data file. For example, you want to find the longest line and then word wrap or line break the longest line before actually processing the data.

Here you go!

 package main

 import (
 "fmt"
 "strings"
 )

 func longestLine(input string) (longest string) {
 lines := strings.Split(input, "\n")

 size := 0

 for _, v := range lines {
 //fmt.Println(k,v, "Size: ", len(v))

 if len(v) >= size {
 longest = v
 size = len(v)
 }
 }
 return
 }

 func main() {
 text := `line 1
 line 2 line 3 line 4
 line 5 line 6 line 7 line 8 line 9 line 10
 line 11 line 12
 line 13 line 14 line 15`

 //fmt.Println(text)

 // find the longest line in text and display it
 fmt.Println("Longest: ", longestLine(text))
 }

Output:

Longest: line 5 line 6 line 7 line 8 line 9 line 10

Happy coding!