golang len return type

package main

import (
    "fmt"
)

func main() {
    str := "Hello, World!"
    length := len(str)
    fmt.Println("Length of the string:", length)
}

Explanation:

1. package main: This line declares that the current file belongs to the main package, which is the entry point of the Go program.

2. import "fmt": This imports the fmt package, which provides formatting and printing functions, among other things.

3. func main() { ... }: This is the main function where the execution of the program begins.

4. str := "Hello, World!": This line declares a variable str of type string and assigns it the value "Hello, World!".

5. length := len(str): The len() function in Go is used to find the length of strings, arrays, slices, maps, and channels. Here, len(str) returns the length of the string stored in the variable str and assigns it to the variable length.

6. fmt.Println("Length of the string:", length): This line prints the string "Length of the string:" followed by the value of the length variable to the standard output using fmt.Println().