Program for length of the last word in a string in Go (Golang)

Overview

The objective is to find the length of the last word in a given string

Example

Input: "computer science"
Output: 7

The last word is science and its length is 7

Input: "computer science is a subject "
Output: 7

The last word is subject and ts length is 7

Input: " "
Output: 0

There is no last word hence answer is zero

Program

Here is the program for the same.

package main

import "fmt"

func lengthOfLastWord(s string) int {
	lenS := len(s)

	lenLastWord := 0
	for i := lenS - 1; i >= 0; {
		for i >= 0 && string(s[i]) == " " {
			i--
		}
		if i < 0 {
			return 0
		}

		for i >= 0 && string(s[i]) != " " {
			//fmt.Println(i)
			//fmt.Println(string(s[i]))
			i--
			lenLastWord++
		}

		return lenLastWord
	}

	return 0
}

func main() {
	length := lengthOfLastWord("computer science")
	fmt.Println(length)

	length = lengthOfLastWord("computer science is a subject")
	fmt.Println(length)

	length = lengthOfLastWord("  ")
	fmt.Println(length)
}

Output

7
7
0

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Also if you are interested in understanding how all design patterns can be implemented in Golang. If yes, then this post is for you –All Design Patterns Golang